The Twilight stars were seen at the event thrown by Globes hosts Tina Fey and Amy Poehler in Soho House, West Hollywood, E! Online reports.
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Pattinson had attended the awards alone and also arrived at the afterparty by himself, reportedly handing Fey a rose as a gift.
Meanwhile, Stewart reportedly arrived at Soho House at about 1am, dressed in jeans, a sweatshirt and a baseball cap.
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Stewart and Pattinson were rumoured to have reunited last year after Stewart was photographed cheating on Pattinson with director Rupert Sanders in July.
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However, recent rumours have suggested that the couple's relationship is "strained" and that they are "fighting a lot".
Zooey Deschanel, Jon Hamm and Michelle Dockery were among the other stars who attended Fey and Poehler's party, which was sponsored by Baileys.
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