Credit: Jason Merritt/FilmMagic

Looks like Jessica Simpson has gotten wind of ex John Mayer's XXX-rated comments about her.

Hours after shared Playboy's shocking new interview with Mayer -- in which he likened Simpson to "crack cocaine" and "sexual napalm" -- Simpson seemed to acknowledge the bombshell on Twitter.

"interesting day so far...hmm," she wrote Wednesday afternoon. "at least i am boxing 2-a-days this week," the single singer, 29, added.

"That girl is like crack cocaine to me," Mayer, 32, tells Playboy of Simpson in its March issue. "Sexually it was crazy...Did you ever say, 'I want to quit my life and just f*****' snort you? If you charged me $10,000 to f*** you, I would start selling all my s*** just to keep f****** you.'"

Simpson, who dated Mayer from 2006 to 2007, hasn't been photographed in public since late January. Her VH1 reality series The Price of Beauty debuts March 15.

Simpson wasn't the only shocking subject matter during Mayer's Playboy interview. The outspoken musician also held forth on his lack of relationships with African-American women, noting "I don't think I open myself to it. My d*ck is sort of like a white supremacist," adding unexpected remarks about actresses Kerry Washington and Holly Robinson Peete.