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Kim Kardashian, Kourtney Kardashian

Flynet

Kim Kardashian and Reggie Bush are handling their split differently.

Kim has thrown herself back into work while in Miami, shooting the second season of Kourtney & Khloe Take Miami, jogging on the beach with her sisters and doting on nephew Mason.

And apparently not even heartbreak can put a dent in her hectic schedule. Tomorrow, she's set to celebrate the one-year anniversary of ShoeDazzle, a website she founded, at the Hilton in South Beach.

As for Reggie, he's busy on the social scene in the Big Apple...

Last week, he attended Robin Thicke's birthday party and was seen clubbing at 3 a.m. And on Saturday, he went to the opening of the Red Bull Arena to see a soccer match and hit the postparty at Avenue.

"Reggie was with two guy friends, hanging out and having fun," a source tells E! News. "In general, he was pretty low-key and just hanging out with his boys. But by the end of the night, Lindsey Vonn and his friends got him dancing!"

But let's not start any romance rumors. The Olympic skier is married and her hubby was there, too.

To be fair, Reggie is in the off season and allowed to celebrate after his team won the Super Bowl. But businesswoman Kim has no off season.

"It was a long time coming," a source close to Kim tells me of their split. "She never sees him. She's the world's busiest human being."

—Additional reporting by Claudia Rosenbaum

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Check out Kim's Single in South Beach gallery!