Novak Djokovic may not be playing a tournament this week, but he's certainly not taking it easy. The world No. 1 has made the rounds from the grand opening of the Mouratoglou Tennis Academy in Nice on Monday to the Novak Djokovic Foundation gala in Milan on Tuesday.

Serena Williams, who was also at Patrick Mouratoglou's event on Monday, took to the red carpet in Milan for the star-studded affair.

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In recent days, the two champions have had a lot of quality fun together—in black tie attire.

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Jelena Djokovic, the Chief Executive Officer of the foundation, had her moment in the red carpet spotlight.

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She and her 12-time Grand Slam champion husband led the night (which was streamed live on Periscope).

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And they looked like they were having a ball (excuse the pun).

Giorgio Armani, Anna Wintour and retired soccer stars Paolo Maldini and Andriy Shevchenko all attended the successful night, as did recently married tennis power couple Fabio Fognini and Flavia Pennettta.

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The Novak Djokovic Foundation benefits preschool aged children by giving grants to educational projects.  All funds from the gala benefited children in Serbia.