The Revenant star, who took home the Best Actor statuette, made the rounds on the Academy Awards party circuit – stopping by the Governors Ball and the Vanity Fair soiree.
Along with his mom Irmelin, who was the 41-year-old's date for the evening, and dad George, DiCaprio and a small group also popped into Ago Restaurant, an Italian eatery co-owned by Robert De Niro in West Hollywood that serves things like veal Milanese and grilled salmon filet in a lemon and caper sauce.
Both Irmelin and George brought their respective partners, the former with boyfriend David Ward, and latter with wife Peggy DiCaprio.
Other revelers included DiCaprio pal Tobey Maguire, and stars Hilary Swank and Benicio Del Toro.
DiCaprio's The Revenant costar Will Poulter joined in, as well as the film's director Alejandro González Iñárritu, who nabbed a trophy for his work.
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The actor's friends and fans were quick to rejoice his win, with Titanic costar Kate Winslet looking visibly emotional as he accepted the Oscar on stage.
Later in the evening, DiCaprio attended talent manager Guy Oseary's private, star-studded house party, which included the likes of Ben Affleck, Charlize Theron and Diddy – the latter of whom gave a speech in his honor.
"Leo was cool, humble and low-key. People came up to him and he had a smile on his face and was really gracious," a source tells PEOPLE. "He didn't seem have a posse around him like he usually does. He sort of waltzed through the room in his own quiet way and people were genuinely happy for him."
Also in attendance were Matt Damon, Julianne Moore, Jared Leto, Lenny Kravitz, and best actress-winner Brie Larson. Music's hottest couple, Blake Shelton and Gwen Stefani, also stopped by, and were seen "taking selfies and looking very cozy and happy," according to a source.
After the after party, DiCaprio had a group of people over to his house, including Kravitz and naturally, "lots of girls" a source said.