Kendall Jenner's birthday surprise

Kendall Jenner got so drunk at her 21st birthday party that she forgot a prince gave her a Rolls Royce

Khloe Kardashian says Kendall Jenner got so drunk at her birthday party that she forgot a prince gave her a car.

The model's sister Khloe Kardashian revealed that the unnamed royal presented Kendall with the expensive vehicle at her birthday bash earlier this week but Kendall didn't remember it the next day. 

Speaking on 'Jimmy Kimmel Live', Khloe said: "We go outside and there's a guy with a Rolls Royce, we're like 'what's the gift, the guy or the Rolls?' 

"And then the guy just hands her the keys to this car. We don't know who this guy is, he's some prince.

"I was like 'Is this a joke?' I think on my 21st birthday I got like a dinner and a purse or something.

"The next morning I asked her about it and she said, 'Oh my God I forgot I got a car!' That's how drunk she was."

The model's new car is the latest addition to her growing collection, which already includes a Range Rover and $100,000 Chevrolet.

Kendall's famous family hired out a private function room, which was decorated with large balloons emblazoned with her name, at Coach restaurant to kick off the festivities and all guests were told to wear floral headpieces at their seats in order to set the mood.

After polishing off their tasty meal, the party moved on to Delilah, where the model was presented with an "adorable" cake, which had a "throwback photo of her in a purple tutu" pasted on. 

As well as the famous family, Kendall's best friend Hailey Baldwin, Cindy Crawford, Kate Mara, Melanie Griffith, Gabrielle Union, Paris Hilton and Jonathan Cheban were in attendance. 

The bash also saw a surprise appearance from Kendall's half-sister Kim Kardashian West, who has kept a low profile since she was held at gunpoint in France last month.