Model Kendall Jenner reportedly left a party holding hands with singer Justin Bieber.

Kendall, who is the half sister of Kim, Khloe and Kourtney Kardashian, was recently spotted leaving the 40th birthday party of Givenchy fashion legend Riccardo Tisco with the "Baby" hitmaker, reports femalefirst.co.uk.

"Kendall and Justin were inseparable for most of the night. Justin has always been good friends with the Kardashians, so he and Kendall go way back," said a source.

"There have been rumours about them dating before and it was even suggested that Kendall played a part in his break-up with Selena Gomez," added the source.

Bieber, who was partying with stars including Kate Moss, P. Diddy, Jared Leto and Kanye West at the bash, is said to have had his eyes on the 18-year-old all night.

"As soon as Justin arrived he made a beeline for Kendall the moment he spotted her," the source was quoted by The Sun newspaper as saying.

"They were seriously flirting and kept going in and out of a photobooth together. There was lots of laughing and teasing and they were taking endless selfies.

"After partying for about two hours they quietly slipped out of the party together and were seen holding hands," added the source.