Lady Gaga is notoriously private about her love life ... but this week, she gave fans an intimate look into her relationship with hot boyfriend Taylor Kinney.

The singer posted a steamy shot of her and the "Vampire Diaries" hunk kissing in a pool on her fan website, LittleMonsters.com ... with the caption "T and Me."

While some outlets are saying Gaga is naked in the pic, it looks like she's wearing a black bikini to us.

Nude or not, there's no denying it's a hot photo -- and a rare look into Gaga's more private world.

The couple first met on the set of the singer's "You and I" video in 2011.

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