Usher’s Malibu playdate

Usher and his son Naviyd monkey around in Malibu!

Though Usher is still in the middle of a bitter custody battle with ex-wife Tameka Foster over their two sons, 4-year-old Usher V, and Naviyd Ely, 3, he looked happy as can be while spending some quality time with his youngest boy and a friend at a Malibu playground on Thursday.

The "Yeah!" singer — who showcased his buff bod in a white tank top and denim shorts -- might have also been smiling because his 2004 album Confessions just surpassed the 10-million mark in U.S. sales! Confessions is only the 19th album to achieve this milestone since Nielsen SoundScan started tracking the data in 1991. The last album to hit the milestone was Eminem's The Eminem Show in October 2011. (And just in case you're interested, the top three albums that have reached and surpassed 10 million in sales in the U.S. since 1991 are and Metallica's Metallica with 15.79 million, Shania Twain's Come On Over with 15.52 million, and Alanis Morissette's Jagged Little Pill with 14.75 million.)

As for his fit physique, Usher has recently started working out hard to prepare for his upcoming role as Sugar Ray Leonard in "Hands of Stone," a biopic about Panamanian boxer Roberto Duran.