Are they just friends, or is there more going on between the two?
Reports are in that Rihanna rocked up, driven by her security team, at Kutcher's $10 million bachelor pad at midnight last night, and didn't leave until 4am.
No comments from either party so far, but the gossip mill is running hot!
Justin Bieber also recently visited Kutcher at his home.
What do you make of the photo?
Photo: TMZ.com; Getty Images/Gareth Cattermole
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