Leonardo DiCaprio has turned 49, but having a girlfriend almost half his age is certainly keeping him young at heart.

The actor, who celebrated his birthday with an all-star bash that included Kim Kardashian, Chris rock and Zoe Saldana, spent a good portion of the evening showering his new girlfriend with kisses in very public displays of affection.

The Oscar winner and Vittoria Ceretti, 25, were opening showing their feelings for each other throughout the night at the event held Saturday in Beverly Hills, an insider tells People.

The couple were ‘affectionate and kissing throughout the night,’ the insider told the outlet.  (Outside the A-list party, there was a rather awkward scene when the actor’s ex fling Victoria Lamas was denied entry to the event that featured a ‘strictly enforced’ VIP guest list.)

Birthday: Leonardo DiCaprio  celebrated his 49th birthday with an all-star bash on Saturday night and spent a good portion of the evening showering his new girlfriend, Vittoria Ceretti, 25, with kisses in public displays of affection. (He is pictured left in Las Vegas in April, and she is pictured right earlier this month)

Hot couple: The loved-up pair are pictured here in Spain in August

Leonardo DiCaprio caught kissing Vittoria Ceretti in Ibiza nightclub

Leo and Vittoria, an Italian model, were first spotted spending time together in Santa Barbara, CA in August.

They were later seen getting cozy at a party in Ibiza in September, before going to Milan and Paris.

Vittoria was also standing by her man at a pre-birthday dinner in Santa Monica Friday at celebrity hot spot Giorgio Baldi with pals Tobey Maguire, Jennifer Meyer and her boyfriend Geoffrey Ogunlesi.

During the course of Saturday’s festivities, several of The Revenant star’s friends hoisted him up and carried him around the room.

Lil Wayne was on the guest list and even sang to the birthday boy.

That seemed to set the mood, as the source revealed, ‘At one point everyone was singing classic hip hop.’

Party time! Kim Kardashian, 43, was among the high-profile guest list for Leonardo star-studded Los Angeles birthday bash over the weekend

House of Gucci reunion: Lady Gaga, 37, and her former co-star Salma Hayek, 57, were both in attendance at the glamorous affair

Battle of the hemlines! Rita Ora, 32, and Kate Beckinsale, 50, both wore show-stopping micro mini dresses with towering heels

A-list couple: Newly engaged Channing Tatum, 43, and Zoe Kravitz, 34, also joined in the fun at Leo’s party

His and hers: Zoe and her husband coordinated in a black and white color palette

Surprise pairing: Olivia Wilde, 39, who split from Harry Styles, 29, last last year, was spotted departing the party with fellow singleton Chris Rock, 58

Lavish bash: Many A-listers arrived at a Beverly Hills mansion to ring in the Oscar winner’s 49th birthday with him. His celebrity guests included Beyonce and Jay-Z, Lady Gaga, Kim Kardashian and Chris Rock

The insider said the party, which included Beyoncé and Jay-Z, kept going until around 4am.

One of Leo’s next projects will be close to his heart.

He is a producer on the animated Ozi: Voice of the Forest.

The movie will focus on a young orangutan orphan who uses her influencer skills to save her forest and home from deforestation caused by a company producing palm oil.

The film premiered at the Annecy Festival on June 13, but has yet to be released in the US, but has 2024 release dates scheduled in Europe.

Voice talent for the project include Laura Dern, Djimon Hounsou and Donald Sutherland.