Which Celeb Was Rihanna Caught Having A Late Night Romp With?

It's been rumored that Rihanna and her abusive ex Chris Brown have allegedly been (not-so-secretly) secretly seeing each other for a year. Whether or not the rumors are true, it looks like Chris might have some competition! The 24-year-old "You Da One" singer was seen making a late night stop at another man's house... and it wasn't Chris'! Which male celeb did Rihanna have a late night romp with? None other than Ashton Kutcher! 

TMZ reports that RiRi made a stop at Ashton's LA home for a late night visit in the early morning hours of March 21.  According to TMZ's photographer, RiRi got to Ashton’s home around the stroke of midnight and didn't leave until almost 4am!

Wonder what they could have been doing... 

Do you think Rihanna and Ashton are really hooking up?