"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," Canseco tweeted this Sunday, March 10, speaking of the Hollywood Exes star, Jessica Canseco.
"I was there a few months back with her when he called her on her phone," he continued.
RadarOnline.com readers know Canseco's bombshell came just hours after Rodriguez, 43, finally proposed to Lopez, 49, with a massive diamond ring.
"She said yes," he captioned a beautiful photo of him holding the "El Anillo" singer.
But despite the fact that both he and Lopez constantly gush about each other in public and on social media, Canseco, 54, says the former baseball shortstop has been unfaithful all along.
"Alex Rodriguez stop being a piece of sh*t stop cheating on Jennifer Lopez," Canseco added.
Soon after he posted the allegations, fans began to question his motives, saying he was only trying to spread rumors to get money and attention.
"I am willing to take a polygraph to prove that what I'm saying about Alex Rodriguez is 100% accurate," he assured.
Rodriguez has not yet responded to the allegations.
The bad blood between the two legends goes back more than a decade. In his 2008 memoir, Conseco accused Rodriguez of abusing steroids. Years later, the Yankees icon admitted to using steroids in the past, and was even suspended for the entire 2014 season for violating the MLB's drug policy. He retired in 2016.
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