Well, no one saw this one coming. Jennifer Aniston‘s ex-husband, Brad Pitt, showed up to her 50th birthday party last night at Sunset Tower hotel in Hollywood, along with every other famous person on the planet.

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You can hear it in the paparazzi’s voices when they recognize Pitt’s car roll up to the venue: “Oh my god, are you f**king kidding me, Brad Pitt got an invite?” As the car makes it’s way up to the front doors, you see the actor make a very quick entrance into the party wearing his usual paperboy hat.

Let’s just remind you that Brad Pitt and Angelina Jolie are at the tail end of their very nasty divorce, where they’ve been fighting over custody of there six children for almost a year now. While Jennifer Aniston and her husband, Justin Theroux, called it quits last February.

While many of us out there wanted these two to get back together. Nobody thought that would even be possible after how their breakup went down. Remember, he ditched her for Angie. Listen, we aren’t saying they’re back together. We just never thought we’d see them in the same room together, unless it was the Oscars.

Pitt wasn’t Aniston’s only ex that made an appearance last night, John Mayer also stopped by to watch her blow out the candles.

As you can Imagine, Twitter is going wild over here the news and people’s reactions have been quite amusing.

With all this Brad talk, we almost forgot to tell you who else was at this insane A-list filled party. Just to name a few: Robert Downey Jr., David Spade, Ellen, Reese Witherspoon, David Arquette

Barbara Streisand, Katy Perry, Orlando Bloom, Kate Hudson, Chelsea Handler

Courteney Cox, Lisa Kudrow, Demi Moore, Sandra Bullock, Jason Bateman, Gwyneth Paltrow, George Clooney and Amal.

Jennifer Aniston Looking Sexy Poolside in Portofino