We would have assumed they hated each other!

Beyonce attended Mariah Carey's All I Want for Christmas Is You concert in NYC on Sunday night, and Mimi couldn't help but heap praise on her pal via social media. β€œI love you @beyonce thank you sooooo much for coming out tonight! β€οΈπŸ˜˜πŸŽ€πŸ™ŒπŸ½πŸ’‹#merrychristmas," she captioned a photo of the pair.

Given the Mariah's World star's massive beef with J.Lo, we're pretty surprised she's so cool with Bey. We must have missed her gushing about the "Lemonade" songstress on Watch What Happens Live! back in May.

"I love BeyoncΓ©. She knows this, most people know that. I'm a fan, I love her and we have fun together, like she's a fun person, she's really cool. I would love to do a collaboration with her," she told Andy Cohen.

That's a whole lotta ego for one friendship!