Tyga thinks Kylie Jenner is mature beyond her years.

The 25-year-old rapper is rumoured to be dating the 17-year-old reality TV star and he doesn't think the age gap is of any consequence, as Kylie is much more sophisticated than the public recognises.

Tyga has told close friends Kylie is more mature than most adults and that there is nothing ''morally wrong'' with them dating, according to gossip website TMZ.

The claims come shortly after Kylie openly flirted with Tyga at Rihanna's Met Gala 2015 after-party earlier this week.

The duo reportedly couldn't resist flaunting their relationship at the star-studded bash at Up & Down nightclub in New York City.

An eyewitness explained: ''There were no PDA moments at all, but they were definitely hanging out. Tyga and Kylie were flirting as it got later in the evening and everyone knew they were a couple.''

Meanwhile, the rapper has reportedly offered his ex-fiancée, Blac Chyna, as much as $500,000 to leave him alone after she claimed he was begging her to get back together for the sake of their two-year-old son, King Cairo.

Another insider recently said: ''He doesn't want her to do any more damage so he's offering her money to stop.

''He doesn't want to see any more texts or any more Instagram disses. He hates it, but he will pay her hundreds of thousands of dollars - half a million if he has to, to get her to chill out. It's the only thing that may work.''