Rihanna & Serena Williams beef? Tennis star 'confronts' Chris Brown's ex backstage at Drake concert, fighting over Drizzy? Rapper leaves with RiRi, Olympian NOT dating coach Patrick Mouratoglou?

Rihanna's always involved in drama somehow! Usually involving a guy...

UPDATE: Rihanna vs. Serena Williams, Drake hoping for sexy threesome? Twitter fans respond to rumored 'girl fight' and rapper's 'baller' status

According to the infamous gossip webloid MediaTakeOut.com, "things went down" backstage at Drake's concert in Paris on Monday evening (February 24), when popular tennis starlet Serena Williams vehemently "confronted" the "Diamonds" songstress.

A "rock-solid" snitch tells MTO that Drizzy invited BOTH RiRi and Williams to the show. Apparently, the Young Money rapper continues hooking-up with the two ladies - at the same time! Well, he allegedly promised both beauties that he'd spend some one-on-one time with them after the performance. That didn't happen...

Once Williams discovered that RiRi was also backstage at the show, she got right up in her face. Some not-so-nice words were exchanged, but nothing physical or violent occurred. The Barbadian beauty's security were right on-hand in case things got out-of-control.

Anyway, Drizzy DID take one of the girls out after the concert... and it wasn't Williams. The Nothing Was the Same crooner grabbed a romantic dinner with Chris Brown's ex, and then they went to party at the popular nightclub Club 79. The former Olympic gold medalist wasn't even invited.

So what's up with that?

Funny thing is, Williams is rumoredly dating her tennis coach Patrick Mouratoglou. But leading up to this "beef" with RiRi on Monday, Williams tweeted:

@serenawilliams: "Everybody needs love."

Interesting... stay tuned as more "romance" details develop! Rumors continuously suggest that although they're not dating, Drizzy and Rihanna are definitely "hooking-up"...