Mariah Rose Faith Biography: Age, Career, Height, Net Worth, Parents, Songs, Movies, Husband

Mariah Rose Faith Casillas, is an American actress, singer, songwriter, and musical theatre performer celebrated for her powerhouse vocals and magnetic stage presence as a cast member of Smosh since 2022.

She transitioned from film school to Broadway-bound theatre, originating roles in Smosh: The Musical (2023) and starring in Smosh: Under the Influence (2024).

Mariah’s original songs like “Chaos Queen” and “Final Bow” blend pop-rock with theatrical flair, while her Smosh sketches showcase comedic timing and vocal runs.

She co-hosts Smosh Mouth and creates solo content blending musical parodies with mental health advocacy.

Profile

• Full Name: Mariah Rose Faith Casillas
• Stage Name: Mariah Rose Faith
• Born: December 29, 1995
• Age: 30 years old
• Birthplace: Valley Center, California, United States
• Nationality: American
• Occupation: Actress, Singer, Songwriter, Musical Theatre Performer
• Height: Unknown
• Parents: Mr. Casillas and Mrs. Casillas
• Siblings: Luke Casillas
• Spouse: None
• Children: None
• Relationship: Single
• Net Worth: $1.8 million

Early Life and Education

Mariah Rose Faith Casillas was born on December 29, 1995, in Valley Center, California, to parents referred to as Mr. Casillas and Mrs. Casillas.

She grew up on a small family ranch with her brother Luke.

She began singing in church choirs at age 4 and starred in local theatre by 7, landing the lead in Annie at 10.

Mariah attended The Los Angeles Film School, studying directing with plans for music videos, but left after two years to pursue full-time theatre in New York.

She trained at the American Musical and Dramatic Academy (AMDA), graduating in 2017 with honors in musical theatre.

She is of rural roots and Mexican-American heritage, though she keeps her religion private.

Career

Mariah launched her professional career in 2017 with regional theatre, originating the role of “Maria” in a West Side Story revival.

She moved to Los Angeles in 2020, booking voice work in Smosh animated shorts before her live audition—a self-written musical Try Not to Laugh—earned her a cast spot in 2022.

She debuted in Smosh Pit and quickly became known for theatrical sketches like “Every Disney Princess Ever” and vocal impressions.

Mariah co-created Smosh: The Musical (2023), writing original songs and starring as the lead.

Her solo EP Chaos & Curtain Calls (2024) hit #12 on iTunes Singer/Songwriter.

She directed Smosh’s 2024 live tour and choreographed dance numbers.

Mariah’s TikTok musical parodies average 5 million views, and she co-hosts Smosh Mouth with rotating castmates.

She advocates for neurodivergent performers and mentors theatre teens in San Diego.

Mariah Rose Faith remains a Smosh standout, developing Smosh: Broadway Bound (2025) and recording a full album.

Her Instagram song covers and Twitch karaoke streams drive brand deals with Fender and Shure.

She’s expanding into film scoring.

Mariah’s blend of belt vocals, comedy, and heart continues to redefine musical theatre in digital spaces.

Social Media

• Instagram Handle: @mrahstagram
• TikTok Handle: @mariahrosefaith
• Twitter Handle: @MariahRoseFaith
• YouTube Handle: Mariah Rose Faith

Personal Life

Mariah keeps her romantic life private, with no confirmed relationships or children.

Based in Los Angeles, Mariah enjoys horseback riding, songwriting retreats in Valley Center, and collecting vintage playbills.

Filmography

• Smosh: The Musical (2023)
• Smosh (2022–present)
• Smosh: Under the Influence (2024)

Discography

• Chaos & Curtain Calls (EP, 2024)

Net Worth

Mariah Rose Faith has an estimated net worth of $1.8 million. Her income primarily stems from Smosh salary, YouTube ad revenue, and musical theatre royalties.

TikTok sponsorships with Glossier and Sweetwater, plus EP sales and merchandise, contribute significantly.