Peyton List Stars As Sierra in 'Happy Together' Premiere Tonight

Peyton List wears a ruby red dress in this still from the premiere of Happy Together, premiering TONIGHT on CBS!

The 21-year-old actress stars as Sierra Quinn in the series, centering on how Cooper James (Felix Mallard), an exuberant young pop star, unexpectedly moves in with a 30-something happily married couple (Damon Wayans Jr. and Amber Stevens West) who have just begun to reconnect with their younger, cooler selves.

Check out what Peyton shared about the project and what it was like to know that Harry Styles, who is an executive producer on the show, saw her audition tape for the part.

If you missed it, check out 10 Fun Facts about Felix on

Happy Together premieres Monday, October 1st @ 8:30PM ET/PT on CBS.