She brought him onstage during her show and surprised him.
Jen had an entire arena sing "Happy Birthday" to Alex on Saturday, while she surprised him with a gorgeous multitiered New York Yankees-inspired cake. Alex seemed shy in the moment and almost like he was holding back tears, while his girl put the spotlight on him so he could feel everyone's love.
He also got a special gift from his girl for all to see.
Jen performed a sexy dance for her man during the show, and things got pretty intense. As the dancer that she is, J.Lo put on quite a show and gave her man a lap dance for his big day. Alex is one lucky man.
They also partied the night away on his birthday.
Alex shared a clip of his birthday party, and it looks like they had a blast. They were both on the dance floor surrounded by friends, and the dancing queen couldn't help but to twerk on the birthday boy some more.
But the surprises didn't stop there!
Jen and his daughters, Natasha and Ella, dropped by ESPN's Sunday Night Baseball while Alex was hosting the show. J.Lo and the kids interrupted the show and brought out a birthday cake, and he looked totally surprised to see them. That is so sweet!