John Mayer's Jennifer Aniston Sleepover CONFESSION!

While the singer was discussing light switches and the unique décor in Jennifer's home, John let it slip that he has been in the star's home in the middle of the night. Ellen then playfully asked the singer, if the two have "sleepovers"?

"Yeah there are sleepovers," John admitted reluctantly. "Yes, yes there are."

In a separate taping of the show, Jennifer laughed when Ellen showed her a photo of her beau and asked if he would attend her 40th birthday party. Ellen then pulled out a different picture of John wearing Borat's infamous risque swimsuit, and the 'He's Just Not That Into You' star looked away and blushed!

Check out the video for a special sneak peek of both episodes and to see John in the skimpy swimwear! Jennifer's appearance airs Friday February 6, while John will be on Ellen's Grammy show on Monday Feb. 9.

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