Almost everyone was happy for the couple but clearly not Jose Canseco, who took to Twitter on Sunday night accusing A-Rod of cheating on J.Lo with his ex-wife Jessica Canseco.
Alex's proposal came just a month after Jennifer insisted she didn't need to get married right now.
Canseco ended his tweets aimed at Rodriguez by saying "I am willing to take a polygraph to prove that what I'm saying about Alex Rodriguez is 100% accurate".
Lopez and Rodriguez announced they had gotten engaged on Saturday, sharing matching photos of Lopez wearing her stunning diamond engagement ringt as Rodriguez romantically holds her hand.
The Yankee slugger was suspended for the entire 2014 season after he was again busted for steroid use.
Canseco and Jessica had a rocky relationship.
Not only is Canseco, 56, throwing around baseless accusations, he's dragging his ex-wife, Jessica, into the mix. He was sentenced to one-year probation as a result.
Cops charged Canseco after he and his wife argued in a auto as they returning from their daughter's birthday party.
In her autobiography "Juicy: Confessions of a Former Baseball Wife", Jessica Canseco details cheating and abuse by Jose Canseco and writes "the guy is an a--e, but the perks are good". "Mr. Canseco grabbed Mrs. Canseco by the hair, then hit her a few times", Miami Police Lieut. He received community service.