She certainly looks like his type!

A-Rod just proposed to J.Lo this past weekend, but their joy was cut short when former MLB player Jose Canseco hopped onto Twitter to accuse the baseball legend of cheating!

Canseco claims the former Yankee has been hooking up with his ex-wife Jessica behind Jenny from the Block's back, and he's willing to take a polygraph to prove he's telling the truth.

"Watching World of Dance watching J.Lo text Alex Rodriguez little does she know that he is cheating on her with my ex-wife Jessica poor girl she has no idea who he really is," he wrote.

"I was there a few months back with her when he called her on her phone. Alex Rodriguez stop being a piece of sh*t stop cheating on Jennifer Lopez," he continued.

"Alex Rodriguez I challenge you to a boxing match or an MMA match anytime you want. I am willing to take a polygraph to prove that what I'm saying about Alex Rodriguez is 100% accurate," he concluded.

We know that the athlete loves muscular women, after dating such celebs as Madonna and Cameron Diaz, so could there be any truth to this? Guess we have to wait and find out!