(Cover) - EN Showbiz - Harry Styles may perform a "tuneful serenade" for a gorgeous young model this weekend.

The One Direction singer has been invited to sing a special song for Cara Delevingne, who turns 20 this month, at her birthday party this weekend.

Cara's sister Poppy is helping to organise the bash and Harry is reportedly happy to croon at the joyous affair.

"As Harry and Cara have hit it off, they thought it would be nice to ask him if he'd sing to her," a source told British newspaper The Sun.

"Whether it's a special rendition of Happy Birthday or something else is undecided. It all depends if Harry has the guts."

Harry has a tough audience to please.

"Cara's a decent singer herself so she'd appreciate a tuneful serenade," the source explained.

Last Saturday Harry and Cara were seen out partying together at exclusive Olympic VIP nightclub Omega House in London's West End.

The chivalrous superstar dropped Cara home in his luxury Range Rover after the festivities. (C) Cover Media