Justin Theroux's Birthday Post For Jennifer Aniston Proves She Really Is The Best

"❤️ you B."

It's a scientific fact that it's impossible to dislike Jennifer Aniston.

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I'm a science expert, so I know it's true. I once dissected a frog in high school!

She's Rachel Green! America's sweetheart! Hydrated Smart Water queen!

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And, honestly, all of Hollywood seems to love her. Case in point: They all showed up to her 50th birthday party over the weekend.

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But the most telling sign of all is that even her exes are still huge Fanistons. Brad Pitt showed up to her party, and her recent ex, Justin Theroux, shared this sweet tribute to her:

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The photo itself not only shows off Jen's sense of humor, but it also reminds us all that she has the best arms in showbiz.

"Fiercely loving. Fiercely kind...and fiercely funny."

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We stan mature, supportive exes!