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Donald Trump Warns Katy Perry to "Be Careful" With John Mayer: "He Dates and Tells"

by Rebecca Macatee Fri., Oct. 19, 2012 1:10 PM PDT

PacificCoastNews.com; Rich Schmitt/ZUMApress.com

It seems like Donald Trump wants to get hired as some kind of relationship expert.

First he was doling out advice for Robert Pattinson and Kristen Stewart. Now the Trumpster's providing his unsolicited opinion on Katy Perry and John Mayer's on-again, off-again romance.

"@katyperry is no bargain but I don't like John Mayer," Trump tweeted Friday. "he dates and tells--be careful Katy (just watch!)."

John celebrated his 35th birthday with Katy

Trump, who has been married three times, does have a point about Mayer's tendency to overshare. He famously told Playboy that sex with ex-girlfriend Jessica Simpson was "like crack cocaine to me" and admitted to Rolling Stone he'd "never really gotten over" his split with Jennifer Aniston.

In his defense, though, Mayer ultimately apologized for kissing and telling. "I did a couple of really dumb interviews," he admitted apologetically on The Ellen DeGeneres Show. "It kinda woke me up…It sort of like rocketed me into adulthood."

We believe him.

Take a look back at the other ladies John has romanced through the years!