"The Boy Next Door" star took to Instagram on her special day and posted a picture of herself wearing a red dress while standing in front of her birthday cake, reported E! Online.
Lopez captioned the cute picture "TBT," and followed with an iconic picture of Marilyn Monroe blowing bubble gum with the text "It's My Birthday!"
The "Maid in Manhattan" actor also posted a photo of Hollywood legend Lauren Bacall and captioned it, "Current mood #itsmybirthday #LEO.