CelebSpin! Celebrity News and Hollywood Gossip.

Why would Justin Timberlake skip the January 24 afterparty for his new drama, Black Snake Moan, after it premiered at the Sundance Film Festival? You would too if you had Jessica Biel waiting at home for you.

Tinseltown’s sexiest bachelorette flew in that very night to stay with the boy-bander-turned-actor at his $1,950-a-night, four-bedroom condo at the Trail’s End Lodge in nearby Deer Valley.

“He called her and asked her to come,” says a source close to Biel, 24, who was spotted snowboarding with Timberlake, 26, the next day at the picturesque Park City Mountain Resort. “And she was like, ‘What the hell? I’ll go!’ She is really spontaneous and fun.”

Though the two rarely left their cozy digs, a mutual pal who spent time with the couple says, “their relationship looked like it was definitely working for them.”

The pair stayed until January 26 and, says a source at the resort, “Justin and his group were fantastic guests.”

Biel’s rep, who won’t comment on Timberlake, says, “Jessica was in Sundance for a couple of days to see some movies.”