Well, we'd smile too if we had a dress like this!
The Girls Aloud singer and X Factor judge looked sensational in a high necked cream gown with thigh high slit, teamed with gold sandals and a cute box clutch.
Husband Jean-Bernard kept one arm around her as they arrived at the venue, while in his other hand he carried two identical silver carrier bags, presumably containing Ant & Dec's 40th birthday presents.
We would LOVE to know what Chezza got them!
(As an FYI, Dec turned 40 on 25 September, while Ant's big day is 18 November.)
It was a star-studded affair as other celebrities helping the cheeky Geordies mark the milestone included Holly Willoughby, Fearne Cotton, Amanda Holden, Stephen Mulhern, Ronan Keating, Marvin Humes, Leigh Francis and Piers Morgan.
Cheryl's just back in the UK after filming her judges' houses portion of X Factor in Rome. She's mentoring the groups this year and asked Jess Glynne to be her special guest judge.
But in a twist, the groups don't yet know which of them will make it to the live shows as they won't find out until a special live episode broadcast from Wembley, where the judges will announce their decision in front of the acts' friends, families and, of course, us viewers.
Check out Cheryl's hair transformation below:
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