Dec's a belly star tonight.
Sophie Mei, 19, tells hosts Ant McPartlin and Dec backstage how she turned to the Middle Eastern dance six years ago.
Speaking at the Manchester auditions, she says: "I've always loved dancing but I've never been that comfortable with it, and then I saw some belly dancers and I found out my curves could be useful for once."
As she steps on to the stage, Dec can barely keep his eyes off her.
And Simon Cowell is also transfixed by her curves.
Fellow judge Amanda Holden jokes: "Is it a yes or a no, Simon?" before Sophie has performed.
An insider said: "Dec was completely gobsmacked when he met Sophie and couldn't keep her eyes off her.
"He really wants her to do well in the competition."
And student Sophie, from Sheffield, is not the only one to win the judges' approval this week.
Grandad Leonard Henry Bennett, 72, impressed them with his strongman act.
Britain's Got Talent is on at 8.05pm on ITV1.
CURVY: Sophie Mei