Accidentally Engaged (2016) on Netflix

Plot summary

Clarissa Byers works as a waitress in Los Angeles while she auditions, and at one audition she spills hot coffee on Chas Hunter, a popular actor who wins the series lead. Still without a career and still single, she goes home for her best friend's wedding and tells her old friends that she has landed a part and is engaged to Chas. The story spreads, and the paparazzi take it up, which threatens Chas's reputation. His publicist, who is also his ex, decides that he should play along and then end things after the wedding. Chas comes to the festivities, where he gets along with the guests.