However, there could be a very innocent explanation to their date, as the pair previously starred in That 70s Show together and have been pals for over 15 years.
Ashton was previously linked to Rihanna after she was spotted sneaking out of his home at 4am.
Brad Pitt has always denied cheating on Jennifer Aniston, but he was heavily rumoured to have been hooking up with Angelina Jolie while they filmed Mr and Mrs Smith together. Photo: bauergriffinonline.com
David Letterman(02 of10)
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David Letterman confessed to a string of affairs with female colleagues after he became the victim of an alleged blackmail attempt in September 2009. Photo: AP
Gareth Gates(03 of10)
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Gareth Gates was alleged to have been conducting an affair with his young 'Les Miserables' co-star Katie Hall, while his wife Suzanne was at home looking after their young child. Photo: Getty Images
Hugh Grant(04 of10)
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Hugh Grant stunned us all when he cheated on then girlfriend Liz Hurley with Los Angeles street prostitute Divine Brown in 1995. Unfortunately for him, he was busted by the police as well as by Liz. Photo: Getty Images
John Terry(05 of10)
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Chelsea footballer John Terry lost the England captaincy after it emerged he'd cheated on his wife Toni with the partner of his former team-mate Wayne Bridge. Photo: AP
Jude Law(06 of10)
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Jude Law was exposed as cheating on Sienna Miller when Daisy Wright sold her story to the press. He got dumped for his troubles, but still Sienna took him back a few years later. Photo: bauergriffinonline.com
Mark Owen(07 of10)
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Take That star Mark Owen has confessed to having affairs with 10 women since he began seeing his wife - almost putting him on par with Tiger Woods in the infidelity stakes. Photo: Getty Images
Tiger Woods(08 of10)
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Golfing legend Tiger hit the headlines in spectacular fashion in 2009 when a string of women came forward claiming to have had affairs with him. Photo: AP
Vernon Kay(09 of10)
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Vernon Kay has confessed to sending sexy texts to a number of different women, leaving wife Tess Daly furious but still standing by him. Photo: AP
Wayne Rooney(10 of10)
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Footballers these days seem virtually unable to keep their trousers zipped up. Wayne Rooney allegedly paid hooker Juicy Jenny £1200-a-night, meeting up for a rumoured seven or more romps, all while wife Coleen was pregnant with baby Kai. Photo: Getty Images