Blonsky began acting in 2007, first portraying Tracy Turnblad in the musical film Hairspray, an adaptation of the musical of the same name.
The film went on to become a commercial and critical success.
Blonsky received praise for her performance, earning her several awards and nominations, including winning a Critic's Choice Awards for Best Actress, and being nominated a Golden Globe Award for Best Actress.

On June 22, 2008, she sang the American National Anthem in the pre-race ceremony at the 2008 Toyota/Save Mart 350 at Infineon Raceway.
In 2009, Blonsky also co-starred in the MTV mystery series Valemont in 2009.
In 2010, Blonsky led in the short lived ABC Family series Huge, which premiered in June 2010, and ran for one season.
For the role, Blonsky received a nomination for a Teen Choice Award.

In 2013, Blonsky appeared in two episodes of the NBC Broadway drama series Smash.
Later that year, she appeared in the film adaptation of the book Geography Club.
The film received mixed reviews.
Blonsky appeared Off-Broadway in the play Stuffed by Lisa Lampanelli at the Westside Theatre in October 2017 to November 2017.
In 2020, Blonsky launched her video blogging series on her Instagram account, in which she chats with other celebrities.
Blonsky began acting in 2007, first portraying Tracy Turnblad in the musical film Hairspray, an adaptation of the musical of the same name. The film went on to become a commercial and critical success. Blonsky received praise for her performance, earning her several awards and nominations, including winning a Critic's Choice Awards for Best Actress, and being nominated a Golden Globe Award for Best Actress.
On June 22, 2008, she sang the American National Anthem in the pre-race ceremony at the 2008 Toyota/Save Mart 350 at Infineon Raceway. In 2009, Blonsky also co-starred in the MTV mystery series Valemont in 2009. In 2010, Blonsky led in the short lived ABC Family series Huge, which premiered in June 2010, and ran for one season. For the role, Blonsky received a nomination for a Teen Choice Award.
In 2013, Blonsky appeared in two episodes of the NBC Broadway drama series Smash. Later that year, she appeared in the film adaptation of the book Geography Club. The film received mixed reviews. Blonsky appeared Off-Broadway in the play Stuffed by Lisa Lampanelli at the Westside Theatre in October 2017 to November 2017. In 2020, Blonsky launched her video blogging series on her Instagram account, in which she chats with other celebrities.
Nikki Blonsky