The Caribbean Queen was spotted leaving the Two and a Half Men star's Los Angeles mansion early Thursday after arriving four hours earlier.
Earlier Wednesday night, the S&M singer was seen grabbing dinner at the swanky Santa Monica restaurant Giorgio Baldi's, along with her friend Melissa Forde.
Dressed sexy as usual, the 24-year-old hitmaker paired up denim hot pants with heels and wore a scarf on her head.
The late night meeting between the sexy stars should spark plenty of speculation, as both of their love lives have been the subject of intense interest and scrutiny: RiRi has recently been linked to her ex Chris Brown, despite their jagged past; while Kutcher's kept a relatively low profile since his shocking split from wife Demi Moore last November.
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