2012–2018: Career beginnings, ''Lorenzo's Time, and Goin' Bulilit'' Mariano was first seen in television as a commercial model starting at the age of nine. She then made her début as an actress when she appeared in ''
Lorenzo's Time in 2012, a television series starring Zaijian Jaranilla. After that, she began appearing on various TV programs such as Maalaala Mo Kaya in an episode entitled Kabibe
(2012), and Princess and I (2012) where she played the role of Young Bianca Maghirang
played by Bianca Casado. She was also a cast member in the youth-oriented show Goin' Bulilit''. In 2013, she appeared in
Juan dela Cruz,
Muling Buksan Ang Puso, and
Maria Mercedes. In all of these series, Mariano played younger versions of all of the main characters. Mariano then starred in the television series ''
FPJ's Ang Probinsyano from 2015 to 2016, portraying the role of Rachel Tuazon,'' the sister of
Arjo Atayde's character. In 2015, she graduated in
Goin Bulilit alongside fellow
Bulilits Carl and Miguel. In 2017, Mariano reunited with her ''
Lorenzo's Time co-star Zaijian Jaranilla and paired up together for a Maalaala Mo Kaya episode, Cellphone.
In the same year, she also appeared in the films Can't Help Falling In Love'' starring
Kathryn Bernardo and
Daniel Padilla as
Bernardo's sister Grace Dela Cuesta, and
Love You To The Stars and Back starring
Julia Barretto and
Joshua Garcia as Ronnabel. In 2018, she made appearances in the television series
Bagani (which stars
Liza Soberano and
Enrique Gil) as the young
Gloria (
Dimples Romana) as well as a cameo appearance in
Playhouse starring
Zanjoe Marudo and
Angelica Panganiban.
2019–2020: Star Magic Circle, Four Sisters Before The Wedding, and "DonBelle" partnership In 2019, she was part of the year's batch of artists launched in the
Star Magic Circle together with
Kyle Echarri,
Melizza Jimenez, Sophie Reyes,
Jeremiah Lisbo, Gillian Vicencio, Arielle Roces, Arabella del Rosario, Anthony Jennings,
JC Alcantara, Glen Vargas, Kendru Garcia, Eisel Serrano, RA Lewis, Javi Benitez, and Aiyana Waggoner. In the same year, she appeared in the
Bugoy Cariño-starrer film
Danztep by Errol Ropero and in the hit series
Kadenang Ginto as Catherine V. Herrera, the daughter of Leon,
Richard Yap’s character in the series, as well as the
Maalaala Mo Kaya episode
Pregnancy Test. She also joined the Asia's songbird
Regine Velasquez-Alcasid in the film
Yours Truly, Shirley under
Cinema One. In November the same year, it was announced that Mariano will be teaming up with
Donny Pangilinan for ''
He's Into Her, an iWantTFC original series directed by Chad Vidanes that is based on the 2013 Wattpad novel of the same name by Maxine Lat a.k.a. Maxinejiji''. In 2020, she was among the first batch of artists from
Star Magic to be handled by
ABS-CBN Film's new talent management arm,
Rise Artists Studio. She had a cameo appearance in the film
James and Pat and Dave (sequel to
Vince and Kath and James) starring
Ronnie Alonte,
Loisa Andalio, and
Donny Pangilinan. She played the role
Trish, hinting the future romance with
Dave,
Pangilinan's character in the film and previewing her love team partnership with him as
DonBelle. For their project ''
He's Into Her'', the production was postponed due to the
COVID-19 pandemic, the
ABS-CBN shutdown and the denial of franchise renewal. In the same year, Mariano landed the role of the iconic
Gabbie Salazar (previously played by
Shaina Magdayao) and starred the prequel of the 2013 hit
Four Sisters and a Wedding, 2020 film
Four Sisters Before the Wedding. She was joined by actresses
Alexa Ilacad,
Charlie Dizon, and Gillian Vicencio as the newest
Salazar sisters. The film became the No.1 top trending film as it arrived on
Netflix Philippines and No.3 on
Netflix Canada and UAE.
2021–present: ''He's Into Her, Daylight'', and future projects (left), during a
Team Robredo–Pangilinan campaign rally in 2022 In 2021, the long-awaited series ''
He's Into Her'' had its record-breaking launch as it crashed the streaming platform
iWant TFC upon its release due to the surge of the number of viewers who wanted to watch the premiere episode. The series was marked a huge success as it continuously trended all-throughout its run, and also helped the iWantTFC app to top all free entertainment apps in the country. It was also the number one most watched series on the streaming platform. Following the series' success, the cast headlined a special online concert, ''
He's Into Her: The Benison Ball for the fans to enjoy through the streaming platform KTX.ph. VIP tickets for the show became sold out after only three days since release. At the end of show, it was announced that a second season of the show will take place. Shortly after the successful concert, ABS-CBN Entertainment also unveiled He's Into Her: The Journey,'' a documentary about the making of the series. It showed the production of the show from the conceptualization, auditions, and the lock-in tapings. With the series' production passing to two years, the documentary also showed the hardship of the entire team and how they managed to push through the show even during a global pandemic and after the
ABS-CBN shutdown. In the same year, Mariano also made her mark in the music scene. She released her debut song
Kung Ako Nalang for the special compilation album,
Kumu Summer Album under Believe Music (on behalf of Nickl Entertainment). Shortly after, she released her debut single
Sigurado under
Star Music which was also included in the sound track of her series ''He's Into Her''. As of May 2022, the single already garnered over 16M streams on
Spotify and 7.5M views on
YouTube. Following the successful ''He's Into Her
, the DonBelle love team landed their first ever lead movie under Star Cinema, romantic-comedy film Love Is Color Blind. The casts include their He's Into Her'' co-star
Jeremiah Lisbo, as well as singer-actress Angelina Cruz, and
TikTok contributor Esnyr Ranollo. It premiered through the streaming platform KTX.ph and Smart's GigaPlay app. Shortly after coming to
Netflix, the film ranked atop the streaming service's trending lists in the Philippines. She also released her debut album
Daylight under
Star Music as well as music video for lead single,
Tanging Dahilan. She also released a visualizer video for
For Your Eyes Only, music video for
Rise and performance video for
Nights of December. Her track
For Your Eyes Only also became the OST for her movie
Love Is Color Blind, marking her second song to be featured as a soundtrack
. She was also one of the artists to take part in
ABS-CBN's 2021 Christmas Station ID, ''Andito Tayo Para Sa Isa't Isa'' along with
Donny Pangilinan,
Martin Nievera,
Piolo Pascual,
Gary Valenciano,
Zsazsa Padilla,
Erik Santos,
KZ Tandingan,
Kathryn Bernardo,
Daniel Padilla,
Sarah Geronimo,
Sharon Cuneta,
Vice Ganda,
Regine Velasquez,
Ogie Alcasid,
Iñigo Pascual,
Andrea Brillantes,
Seth Fedelin,
BGYO, and
Darren Espanto. In 2022, she opened the year through her successful concert
Daylight: A Belle Mariano Digital Concert which was streamed via KTX.ph. Her first-ever solo concert reportedly sold over P300,000 worth of tickets in just two minutes after selling and reached over P500,000 in 30 minutes. SVIP and VIP tickets were also sold out. Her guest performers for the concert include
Kyle Echarri,
Ben&Ben, singer-songwriters
Jayda Avanzado, SAB (Sabine Cerrado), Trisha Denise, and her love team partner
Donny Pangilinan. As her first acting project of the year, she starred in the third season of
iWant TFC's original anthology series,
Click, Like Share for the episode
Swap with former
Pinoy Big Brother housemate and fellow
Rise artist
Shanaia Gomez. After starting taping and production in February, the most-awaited second season of ''
He's Into Her officially premiered on April the same year. Upon release of the pilot episode, the series immediately became a trending topic in the Philippines. Together with the series, its soundtrack album was also released. Kahit Na, Kahit Pa'', a song by Mariano was among the songs in the album, it peaked #1 on the top 10 songs on
iTunes Philippines. Apart from this, the Movie Cut of the first season of ''He's Into Her
premiered at the Drive-In
Cinema One: A Drive-Thru Movie Experience,'' in partnership with
Ayala Malls Vertis North and Vertis North Estate. In August,
Star Magic toured in the United States as part of their 30th anniversary celebration. Mariano was among those who staged the shows. The artists first performed in the
Newport Performing Arts Theater,
Resorts World Manila, followed by the US shows in
Kings Theater, Brooklyn,
The Warfield, San Francisco, and in the
Saban Theatre, Beverly Hills. She personally attended the 17th
Seoul International Drama Awards that was held on the 22nd at the
KBS Hall in
Seoul, graced the red carpet event, and shared the stage with K-pop star
Kang Daniel, and Japanese actor and singer Yusei Yagi as she received her award and said her acceptance speech. Mariano won the Listeners’ Choice Award at the inaugural
Billboard Philippines Women In Music in March 22 and announced the July 5 release of her
sophomore album "Believe", as
sequel to "Daylight". Earlier she released
extended play "And Solemn" on January 27. Her joint single with
Ben&Ben, “Autumn,” was released in December 2023, with a
music video. Mariano launched her makeup brand
Talee with her sister Daniela in November 2025. ==Filmography==