CANNES, France — Tumblr founder David Karp had a billion reasons to celebrate at the Cannes Lions festival.
A month after selling his wildly popular blogging platform to Yahoo! for a staggering $1.1 billion, the 26-year-old Bronx HS of Science dropout partied hard with Sean “Diddy” Combs at the lavish bash for advertising bigs.
The newly minted multimillionaire — surrounded by a bevy of gorgeous women — had a mile-wide smile as he downed bottles of Dom Perignon Lumiere at the exclusive jet-set club Gotha Thursday night.
Diddy spun discs and performed until 4 a.m. at the soiree to a crowd that included the rapper Nas, hip-hop author turned 2012 Ad Age executive of the year Steve Stoute and a host of other advertising heavyweights.
Tumblr has a strong presence at Cannes, sponsoring the Gutter Bar, an epicenter of excess where entertainers and business types party until the sun comes up.
The tech company has even been ferrying ad execs by helicopter to St. Tropez for meetings as Karp looked to impress new clients. The Upper West Side native had earlier given a presentation to delegates at the festival — officially known as the Cannes Lions International Festival of Creativity but dubbed the Oscars of the advertising world.
But during the speech he insisted he wasn’t on the French Riviera just to party.
“A lot of my friends have come to the Gutter Bar, but I have mostly been waving from across the road, sitting under a palm tree,” Karp said.
He also sucked up to his audience — and dissed his own colleagues back at Tumblr headquarters on East 21st Street in Manhattan’s Silicon Alley.
“You guys are more talented than any one in the Tumblr office or in Palo Alto or Sunnyvale,” he said from the main stage. “We’re constantly in awe, constantly in service.”
Earlier, Karp had raised eyebrows by lashing out at rival social-media site Twitter while touting his own site.
Twitter, he said, was “really gross” for listing how many followers users have. Tumblr, he boasted, doesn’t tell the whole world about everything you do on the short-form platform.
Karp, a tech savant who dropped out of Bronx Science at 15, personally made more than $200 million from the sale to Yahoo!