Jennifer Hudson [ tickets ] and Carrie Underwood [ tickets ] have been added to the lineup for the 51st Annual Grammy Awards [ tickets ], to be held Feb. 8 at the Staples Center in Los Angeles. Hudson and Underwood, both current Grammy nominees, join previously announced performers and nominees Kenny Chesney, Coldplay, Jonas Brothers, Lil Wayne and Katy Perry.

This year, Hudson is nominated for three awards: Best Female R&B Vocal Performance, Best R&B Performance by a Duo or Group with Vocals, and Best R&B Album.

Three-time Grammy winner Underwood is nominated for Best Female Country Vocal Performance.

In other Grammy news, this year's "My Grammy Moment" segment will feature videos of contest winners singing with Katy Perry on her hit song "I Kissed A Girl." To enter, fans can upload a 30- 60-second video of themselves singing the song at CBS's Grammys website. Videos will be voted on by the public and the most popular videos will be shown as part of Perry's performance on Grammy night.

The Grammy Awards show air on CBS and be covered online at Grammy.com, CBS.com, Twitter, Facebook, YouTube and Last.fm.