Cara Delevingne is planning a festival-themed 21st birthday party.

The British model will fly her A-list pals out to Ibiza to celebrate her landmark birthday at the end of August, and is taking her favourite tattoo artist, Bang Bang, along for the ride.

A source told the Daily Star newspaper: ''Cara couldn't decide between a muddy UK field and guaranteed sunshine for the celebration so she decided to make her own festival in Ibiza.

''Rita [Ora] and Rihanna will be encouraged on the microphone.''

As well as her two superstar friends, Pixie Geldof, Jade Jagger and Georgia Jagger are rumoured to be on the guest list, as well as Kate Moss and Radio 1 host Nick Grimshaw.

Cara, 20, wants to make sure her entourage never forgets the special occasion so has enlisted Bang Bang to ink all of her party guests before they leave.

The insider added: ''Bang Bang told how Katy Perry did something similar at the end of her California Dreams tour. Cara's flying Bang Bang over for a week, to set him up in a tent to tattoo her whole team as a thank you.''

The New York-based tattoo artist has got Cara hooked on body art after he drew a lion on her index finger, shortly followed by her initials, CJD, on the side of her hand.

He revealed earlier this month: ''She wants 'Made In England' done under her foot next and I've told her it's going to be super painful. I'll numb her foot.''