Rihanna banned Rita Ora from her Met Gala after-party.

The 27-year-old singer - who held the bash at Up & Down nightclub in New York City following the prestigious event at the Metropolitan Museum of Art on Monday (04.05.15) - is said to have refused to give the 'How We Do' hitmaker an invitation to her event as the pair reportedly can't stand each other.

Rihanna - who is signed to the same record label, Roc Nation, as the blonde beauty - is said to have seen the opportunity to ban Rita from the star-studded party as a ''chance for revenge'' and made it clear she wasn't to be let into the bash under ''any circumstances''.

A source said: ''She has a real issue with Rita and this was her chance for revenge.

''She made it clear when organising her party that Rita was not to gatecrash under any circumstances.''

Prior to the party, the 'Rude Boy' hitmaker is also said to have spent the night hanging out with Rita's former best pal Cara Delevingne, which caused a ''very icy'' atmosphere between the 24-year-old singer and the supermodel.

However an insider close to Rita has insisted she had no plans to attend the after-party and was happy to spend the evening hanging out with 'Wrecking Ball' hitmaker Miley Cyrus instead.

A source said: ''It was very icy between Rita and Cara. They spent the night trying to ignore each other. Rita decided to hang out with Miley Cyrus instead.

''She was never going to attend Rihanna's party because she'd made plans to go to another bash.''

While 'The Voice' judge was later spotted attending Lady Gaga's after-party at the Diamond Horseshoe nightclub, other stars, including Kendall and Kylie Jenner and Lewis Hamilton, were out in full force at Rihanna's event.

Her rumoured love interest Leonardo DiCaprio is also said to have made an appearance.

A source told The Sun newspaper: ''He turned up but didn't join Rihanna in her area behind the DJ booth.

''He bought his own table and sat with Kylie and Kendall Jenner and Lewis Hamilton. But he made a lot of eye contact with Rihanna and wanted her to know he'd come.''