The recently reunited couple, back together after a brief split last year, dined out at London's Nobu Berkeley restaurant with friends.
Having arrived in her pink Range Rover, Price and Penna - who had been in Glasgow during the week - opted to leave the venue in a taxi around 1am this morning.
Laughing, the Argentinian model stuck up both middle fingers at waiting paparazzi, before sharing a kiss with the mother-of-three.
Recent reports have suggested that the duo could announce their engagement after this weekend's London Marathon. Heat magazine claimed that they will travel to Spain together, where Penna allegedly plans to pop the question.
Both Penna and Price recently turned their cameras on photographers, when they were spotted at the Gaucho International Polo game in the O2 Arena.
> Katie Price, Leandro Penna 'to appear on X-rated Strictly-style show'