Cameron and wife Samantha enjoyed a post-election celebratory meal at the at Mark's Club, an exclusive private members club in Mayfair.
The 48-year-old Conservative leader and his 44-year-old wife arrived at Mark's Club, Charles Street, on Saturday evening after Cameron's party secured an unexpected -- if incredibly slim -- majority.
The club is highly rated by respected Zagat restaurant guide, which notes members reportedly claim "if you have to ask how much it costs, you can't afford to eat here", The Independent reported.
However, Cameron appeared to flout the club's dress code, which stipulates "Gentlemen are required to wear a suit and collared shirt as well as a tie at dinner", appearing in an open necked shirt.
Mark's, acquired by entrepreneur Richard Caring, is among London's most exclusive clubs and is described as offering members an environment "discreetly insulated from the hectic pace of the city outside."
Cameron has promised to lead a government for "one nation" after his party won its first majority since 1992 with 331 seats.