Cheryl Fernandez-Versini makes rare appearance with husband JB at Ant and Dec's 40th birthday bash

The X Factor and her other half went all out for the party in London on Thursday

Cheryl Fernandez-Versini looked ready to party the night away as she arrived with husband Jean-Bernard at Ant and Dec's joint 40th birthday bash.

The X Factor judge, who hasn't been seen with her other half for a number of weeks, dazzled in a white dress with a thigh split, while JB opted for a dapper blue suit and was a true gentleman carrying their gifts for the birthday boys.

Loved-up Cheryl and JB joined a host of celebs, including Fearne Cotton and Amanda Holden, at the TV duo's joint private bash at Kensington Roof Top Gardens in London on Thursday.

FameFlynetCheryl Fernandez-Versini and her husband Jean-Bernard Fernandez-Versini arrive at Ant & Dec's joint 40th birthday party in London, England.

FameFlynetCheryl Fernandez-Versini and her husband Jean-Bernard Fernandez-Versini arrive at Ant & Dec's joint 40th birthday party in London, England.

Ant, who turns 40 in November, and Dec, who reached the milestone last month, booked out an entire venue to celebrate with all their star pals, as revealed in The Mirror.

The double act booked 80s cheesemongers Black Lace – whose songs include cringeworthy No 2 hit Agadoo – to perform at the party but Cheryl didn't look ready to push some pineapples and shake some trees in her elegant ensemble.

She wore her hair down in styled waves and leg-bombed her way past the paparazzi in gold heels, adding huge sparkling earrings for the special occasion.

Cheryl and JB looked happier than ever after he missed The Daily Mirror's Pride of Britain Awards and didn't accompany the singer to her former bandmate Nicola Roberts' 30th birthday in London recently.

But he made sure he pulled out all of the stops for Ant and Dec, who were thought to have been joined by the likes of Holly Willoughby, Phillip Schofield, Paddy McGuinness and celeb couple Tess Daly and Vernon Kay.

The duo wanted a proper blow-out before heading to Australia to film I'm A Celebrity ... Get Me Out Of Here! and we imagine stars were clamouring to get an invite.

An insider said before the party: "All those famous faces, the greats of British television, all dancing along to Agadoo... The lads think it will be a proper laugh.

"Not only is it their 40ths, but it also coincides with them going Down Under for a month, so it gives them a nice big send off too."