Leonardo DiCaprio dressed down for an outing in London with his girlfriend, Vittoria Ceretti, and her family on Thursday.

The 49-year-old Hollywood actor went sightseeing with his 25-year-old Italian supermodel fiancée, who was accompanied by family and friends.

Leo kept a low profile, wearing a black baseball cap and a light blue face mask to obscure his face.

Despite his mask, he occasionally removed it to converse with the group as they went down the street.

The Oscar winner dressed down in a plain white T-shirt and grey trousers, which she paired with a dark blue bomber jacket and black sneakers.

Vittoria, his 23-year-old sister, wore enormous light blue trousers with a long black coat and a grey woollen scarf for comfort against the winter chill.

Leo finished off his look with a dark blue bomber jacket and a pair of black sneakers.

Vittoria, nonetheless looking effortlessly chic in enormous light blue denim, kept warm with a long black coat and a grey woollen scarf.

It comes after Leo celebrated his 49th birthday earlier this month, with Vittoria and other A-list guests in attendance.

According to People, the couple was ‘affectionate and kissing throughout the night,’ as they packed on the PDA.