has refused to give up on her relationship with estranged husband Carey Hart
- they rang in 2009 together despite having split last year.
The pop punk joined her motocross star ex at his club in Las Vegas, and spent the hours up to the New Year with Hart and pals in the nightspot's VIP room.
And Hart proved his gentlemanly qualities by escorting his former partner to the stage for her 30-minute performance at Sin City's Hard Rock Hotel.
But despite frequent rumors of a reconciliation, the pair failed to share a New Year's eve kiss.
A source tells People.com
, "They didn't really talk much, but at midnight Carey grabbed her and took her up to the stage and introduced her. He sort of led her to the stage."
The So What
hitmaker recently admitted she is not interested in dating any other men since ending her marriage - because she still has feelings for Hart.
(This news article provided by World Entertainment News Network)