Rihanna vs. Rita Ora Beef Amid Drake 'Loose' Shade, Cara Delevingne Stuck In Middle? Roc Nation Rival 'Banned' From Met Gala 2015 Party

Following NYC's star-studded Met Gala on Monday evening (May 4), infamous #BadGal Rihanna hosted a hugely exclusive after-party at the city's renowned Up & Down nightclub. Several big-name celebs were invited - but apparently NOT fellow Roc Nation songstress, Rita Ora! Wonder how Jay-Z must feel about that - is yet another epic industry feud brewing?

RiRi's late night bash was a mega-hit, but according to the UK's popular gossip webloid Mirror, Ora wouldn't know...

Apparently, the 27-year-old "Pour It Up" songstress doesn't really like Rob Kardashian's ex - at all. So she "banned" Ora from the party as an amusing form of "revenge."

An alleged insider for The Sun claims that security was told not to allow Ora into the venue - no matter what. The snitch explains:

"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."

Now, stunning fashion model Cara Delevingne's even stuck in the middle! The 22-year-old English bombshell is close friends with both pop sensations. She spent the majority of the evening hanging-out with RiRi, which caused a "very icy atmosphere" between her and 24-year-old Ora. Another source reveals:

"It was very icy between Rita and Cara. They spent the night trying to ignore each other."

But supposedly the "How We Do" beauty isn't too offended - she didn't even want to attend the party. Instead, she had a good time chilling with "Wrecking Ball" twerker, Miley Cyrus.

Meanwhile, the drama surrounding RiRi's "romance" with both rapper Drake and Hollywood heartthrob Leonardo DiCaprio continues. The "Titanic" star actually attended her event, but the two "friends with benefits" didn't really spend much time together:

"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" (via The Sun).

Awkward. Should Chris Brown's ex stop "playing the field" before she gets a really bad rep?

Drake 'Wins' Chris Brown Beef, Rihanna Hook-Up Sparks 'Thot' Bashing: Ditches 'FWB' Leonardo DiCaprio For Ex-Boyfriend At Nightclub [PHOTOS]