[2] Her father is of English, German, and Irish descent; her mother, originally from the Bronx, New York, is of Puerto Rican ancestry.

[4][6] In 2003, Justice began her acting career, making a guest appearance on the Gilmore Girls episode "The Hobbit, the Sofa and Digger Stiles".

[7] After her appearance in the series, her family ultimately moved to Los Angeles, and Justice began to pursue a career in acting more intently.

The following year, she guest-starred on the second episode of the Disney Channel series The Suite Life of Zack & Cody, in which she played a young pageant contestant named Rebecca.

[8] In 2005, Justice was accepted into the musical theatre program at the Millikan Performing Arts Academy in Los Angeles.

[9] She also appeared in several advertisements for companies such as Ralph Lauren, Gap, Guess, Mervyn's, Peanut Butter Toast Crunch cereal, and Ovaltine.

[10] That same year, Justice landed a leading role in the Nickelodeon series Zoey 101 as Lola Martinez, a new student who is also an aspiring actress.

[16][17] After the success of The Naked Brothers Band special in which Justice guest starred, she appeared in another episode, "The Premiere", on April 11, 2009.

And, after that, Dan found out that I could also sing and dance as well as act, so he thought it would be really cool to create a show for me on Nickelodeon, called Victorious.

"[21] The pilot for the show debuted on March 27, 2010, and received 5.7 million views, making it the second-highest rated premiere for a live-action Nickelodeon series.

[citation needed] Justice later guest-starred on the animated series The Penguins of Madagascar, voicing the character of Stacy in the episode "Badger Pride".

[29] In October 2013, it was announced that Justice had been cast as Lindy Sampson in MTV's Eye Candy, a cyber thriller based on the novel by R. L.

[32] Justice also competed against Gregg Sulkin in an episode of Lip Sync Battle that aired on July 30, 2015, performing Bonnie Tyler's "Total Eclipse of the Heart" and Nelly's "Hot in Herre".

[33] On October 20, 2016, Justice played Janet Weiss, one of the lead roles in the Fox musical film The Rocky Horror Picture Show: Let's Do the Time Warp Again.

[34] It is a tribute[35] to the cult classic 1975 film of the same name and was directed by Kenny Ortega, using the original script written by Richard O'Brien and Jim Sharman.

[40] Along with Spencer Sutherland and Jessica Rose Weiss, she released the soundtrack EP to which she performed and co-wrote a song titled "Home".

[46] On February 19, 2023, coinciding with her 30th birthday, Justice released the single "Last Man Standing" and confirmed that she was working on her debut studio album.

[49] In an interview with Seventeen, Justice stated, "I was looking into different charities and hearing these girls in Guatemala and Africa talk about having to walk miles for water and crying because they don't have any money to go to school.

"[50] Justice's musical influences include Madonna, Britney Spears, Pink, Sara Bareilles, Coldplay, No Doubt, the Jackson 5, the Beatles, Amy Winehouse, Lily Allen, Hall & Oates, Billy Joel, Carly Simon, Karen Carpenter,[51] Elton John, Alanis Morissette, Carole King, and Diana Ross.