Macaulay Culkin, the American actor who became a household name because of his antics as young Kevin McCallister from the 1990s' Home Alone, looks nothing like his old self anymore.

After worrying fans with his disturbingly gaunt appearance in 2012, the actor seems to have undergone quite a transformation as he was recently spotted in Paris during the Thanksgiving holidays.

Unlike his freakishly thin frame before, Culkin appeared healthier and thick, looking almost unrecognisable in the new photos as he walked down the streets of the French capital.

The 37-year-old actor was accompanied by his new girlfriend Brenda Song and his goddaughter Paris Jackson for the trip to the city's famous eateries, the Mail Online reported.

Decked in a navy blue jacket and trousers, Culkin cut a dapper figure during the night out while his girlfriend – better known as London Tipton from The Suite Life of Zack and Cody – kept it simply stylish.

Song complemented the former child actor's crisp suited look in a pair of dark denims, turtleneck sweaters and a pair of glasses. The third wheel with the couple – Michael Jackson's teenage daughter Paris – however was rocking her usual boho chic fashion with a scarf wrapped around her neck while keeping her golden locks loose.

According to the Daily Mail, which published pictures of Culkin's Paris trip, the trio paid a visit to some of the most famous eating joints in the city – including Chef Joel Robuchon's L'Atelier, a restaurant with two Michelin stars.

Paris Jackson and Macaulay Culkin
Paris Jackson has a close relationship with her godfather Macaulay Culkin Instagram

Following the gastronomical indulgence, they hit the streets, enjoying a stroll along the Seine on the Pont des Arts.

Culkin and Song first sparked dating rumours when they were snapped at celeb hot spot Craig's in Los Angeles in July. Since then the pair has been going strong and has made a couple of appearances together.

While the date night photos have got the Home Alone star's fans all excited, what they have been most thrilled about is the actor's changed and healthier appearance.