FIRST PIC: Jennifer Lopez Steps Out With Twins, 3, Post-Split

Credit: GSI Media

Single mommy, reporting for duty.

Jennifer Lopez had a day off from filming What To Expect When You're Expecting in Atlanta on Sunday -- so she treated her adorable 3-year-old twins Max and Emme for a special day.

It's one of the first times Lopez, 42, has been photographed with her kids since she and their father, Marc Anthony, announced the end of their 7-year marriage.

With mom Guadalupe in tow, Lopez and the kids played at an Atlanta playground, where Max and Emme played on the jungle gym as Lopez looked on from a swing set. Later, they cooled off with some snowcones.

Lopez has been in fine spirits since she and Anthony, 42, parted ways. Last Saturday, she spontaneously sang "I Will Survive" at a birthday bash held in her honor at Miami Beach's Scarpetta. The next day, she partied on a yacht (christened "Never Say Never") and had another celebration at the Forge.

"She's just so glad to be free," a pal tells Us. "She's really feeling on top of the world."