Jude Law and Sienna Miller are expected to remain in London for the next year, as Jude is set to begin filming the Sherlock Holmes sequel here in October.
They dined with the film's star Robert Downey Jr. and his wife Susan Levin at upmarket J Sheekey in Covent Garden on Sunday night.
The seafood restaurant was a favourite haunt of Sienna's in 2005 when she starred in As You Like It at the nearby Wyndham's Theatre.
The chic foursome all dressed up for the occasion. Sienna wore a simple black dress and bright pink lipstick, while Jude looked dapper in a grey suit. He appeared to be adopting the 'JLS Marvin Humes look', with a very low cut white T-shirt.
Robert Downey Jr rugged up in a black suit and cardigan, and his wife Susan looked elegant in black satin trousers, heels and a blazer.
Law and Downey Jr, who portrayed Sherlock Holmes and Dr John Watson in Guy Ritchie's 2009 hit, seemed to have plenty to catch up on, and stayed at the restaurant until 11.30pm.