By Evan Lambert

08/08/2012 at 08:00 PM EDT

Natalie Coughlin and Nathan Adrian

Ringo/Pacific Coast News

With two successful Olympic outings and six gold medals between them, swimmers Natalie Coughlin and Nathan Adrian had plenty to celebrate when they went out for late night Lebanese food on Monday.

Adrian, 23, and Coughlin, 29, were joined by fellow gold medalist Matt Grevers and his fiancée Annie Chandler when they grabbed 3 a.m. kebobs at a London’s Ranoush restaurant.

Adrian – who had attended a party with Michael Phelps earlier – was also spotted giving Coughlin a back rub. But even though the two have been seen hanging out in London on multiple occasions, they are just friends: Coughlin is married to California-based swim coach Ethan Hall.

While Adrian won two gold medals at the London Olympics – including an individual gold in the 100m Free – Coughlin (who is also one of PEOPLE’S “12 Hot Female Olympians”) won a bronze for participating in a heat of the U.S.’s 4×100 free relay.