Andre Agassi has a lot to be thankful for. The 55-year-old former tennis player celebrated his mom's 88th birthday by sharing a throwback photo. Andre's mom, Elizabeth "Betty" Agassi turned 88 years old on Wednesday, November 26.

The tennis legend posted three photos to his one million Instagram followers, writing: "Happy 88th Birthday Momma! Love you so much." Andre shared a sweet black-and-white photo of him and Betty walking, one of her opening birthday presents, and even a throwback photo.

The throwback shot was a "got milk" ad , where both Andre and Betty had milk mustaches, and sat on a tennis court. The ad said: "Great serve, mom. Nine essential nutrients. Advantage Agassi." Friends and fans loved the post. Reality star, Nicolas Prusinski , wrote: "I remember the puzzle i

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