Let's not throw Jay under the bus just yet, the blonde Becky the media is saying he's having an affair with has came out and is not only denying the allegations but is also demanding an apology, according to TMZ.
"The reality TV star accused of having an affair with Jay Z is flat out denying she ever had sex with Beyonce's man ... and now she's gearing up for a legal battle.
Casey Cohen -- who was on the Bravo show "Princesses: Long Island" -- was named as Jay's alleged side piece in several magazines (such as In Touch) ... all owned by Bauer Media Group.
TMZ has learned Cohen has hired a lawyer who fired off a cease and desist letter saying Cohen and Jay Z "have never been in love or intimate" -- and dismissing all the Bauer articles as "a foul and phony mistress-rumor."
Cohen cops to having met Jay Z and Beyonce several times -- in the letter, obtained by TMZ -- but only through her job working as a VIP hostess in New York City.
She is demanding Bauer issue a public apology to her, Jay Z, and Beyonce ... and remove all posts about her from the Internet.
We've reached out to Bauer Media, but no word back."