KE$HA'S GUIDE TO STAR PARTY
JASON DERULO
Home: Miami.
Fact: First artist signed to Warner Bros. by "American Idol" judge Kara DioGuardi.
Hits: "Whatcha Say," "In My Head." Also co-wrote Pitbull's "My Life" and Iyaz's "Replay."
Ke$ha says: "He's a sweetheart and has a beautiful voice."
B.O.B.
Home: Atlanta.
Fact: Guests on his album include T.I., Eminem, Paramore's Hayley Williams and Weezer's Rivers Cuomo.
Hits: "Nothin' on You," "Airplanes."
Ke$ha says: "He's a nice guy with good, positive energy and I like his music."
TAIO CRUZ
Home: London.
Fact: Named his album "Rokstarr" after a line of sunglasses.
Hit: "Break Your Heart." Also has written and produced for Justin Timberlake, Britney Spears and Pussycat Dolls.
Ke$ha says: "I just filmed a video with him in the U.K. for a song called 'Dirty Picture.' He's an incredible songwriter and one foxy dude -- and one of the sweetest people you'll ever meet."
ORIANTHI
Home: Adelaide, Australia.
Fact: Guitarist for Michael Jackson's "This Is It."
Hit: "According to You," "Shut Up and Kiss Me." Also has played with Carlos Santana, Carrie Underwood and Adam Lambert.
Ke$ha says: "She's an incredible guitar player."
TRAIN
Home: San Francisco.
Fact: "Drops of Jupiter" earned Grammys for best rock song and best arrangement.
Hits: "Hey, Soul Sister," "Drops of Jupiter," "Meet Virginia." Frontman Pat Monahan also duets on Kris Allen's new "The Truth."
Ke$ha says: "I'm excited to meet them."
LIFEHOUSE
Home: Los Angeles.
Fact: They had the most played radio song of 2001 ...
Hit: "Hanging by a Moment."
Ke$ha says: "I'm excited to meet them."
KE$HA
Home: Nashville.
Fact: Her family was featured on the Paris Hilton/Nicole Richie show "The Simple Life" in 2005
Hits: "Tik Tok," "Blah Blah Blah," "Your Love Is My Drug." Also co-wrote songs for the Veronicas and Miley Cyrus.
JON BREAM