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Jennifer Lopez, Twit Pic

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Jennifer Lopez: Cupcake baker by day, A-list star by night.

Such is the life for the working supermom, who's celebrating twins Max and Emme's 5th birthday today, and she shared a sweet photo of the cupcakes she baked for the occasion.

"Happy Birthday Coconuts!!! 5 years of joy and true love!!! #schoolcupcakes #momduties #bestfeelingever," she posted on her Twitter page along with a pic of 24 yummy treats. 

E! News has exclusively learned, however, that Lopez and boyfriend Casper Smart also treated Max and Emme to a birthday pizza lunch at Planet Dailies at the Grove mall in L.A.

"It was a really cute family outing," an eyewitnes tells us. "J.Lo sat at the head of the table and Casper was by her side, and her mother was with them, too. They all ate pizza and fries and were laughing and giggling with the kids."

"Casper was very hands on with the children and was entertaining them and helping Jennifer make their birthday lots of fun," the source adds. "Aside from the giggles they were very low-key and like a proper little family. It was very sweet to see."

Then, after the pizza, it was off to Dylan's Candy Bar for dessert!

Lopez's twins are from her previous marriage to Marc Anthony, and the friendly exes recently reunited for a family birthday party with Smart and Anthony's ex-girlfriend Shannon de Lima.

In addition to spending time with her family, the "On the Floor" singer recently stunned at the 2013 Grammy Awards where she wore $5 million worth of jewelry and rocked a sexy thigh-high slit in a black Zuhair Murad gown. 

But today, J.Lo was just your average mom, baking and celebrating her children's birthday! 

—Reporting by Melanie Bromley

(Originally published Feb. 22, 2012, at 1:32 p.m. PT)