Rihanna 'Drunk' at Kings of Leon Concert [VIDEO]: Chris Brown's Ex Stumbles Out of Heineken-Sponsored Show, Tweets 'Easily Best Night of Our Lives!' [PHOTO]

Rihanna hit up a Kings of Leon concert in Poland over the weekend - and it appears the "Diamonds" songstress may have had a little too much to drink at the Heineken-sponsored event! One fan captured a video of RiRi stumbling out of the venue... apparently inebriated. The Barbadian beauty later tweeted, “Easily the best night of our lives! To the Kings, we love you for life! Thank you always! #KingsOfLeon #KOL.”

When we say stumble... we mean totally-falling-over-her-heels-about-to-puke-wasted. At least that's what it looks like:

Or perhaps RiRi was just so tuned-in with the music, she couldn't control herself...

Yeah...

But who knows - it IS difficult strutting around in those sky-high heels.

Here's what some fans are saying about Rihanna's alleged drunk walk-of-shame:

MrMessiCar: "So this is the inspiration for the song Walks like Rihanna."

Bojan Toporis: "So what?! She have all the righst to get wasted hehe."

Johnny Khoury: "Its was HEINEKEN festival ... Who can she dont get drunk #beer."

Some witnesses claim they saw RiRi entering her hotel after the show, and she looked completely fine. So maybe her legs just fell asleep after the show.

Following the July 6 Kings of Leon concert, Rihanna tweeted:

@rihanna: "Easily the best night of our lives! To the Kings, we love you for life! Thank you always! #KingsOfLeon..."

At least she had a good time!