(CNN) Jennifer Lopez stopped in the name of love during her concert in Miami.

The singer brought her fiancé, former MLB player Alex Rodriguez , on stage Friday to celebrate his 44th birthday -- with a cake and a song.

In a video Lopez posted to her Instagram, the singer is seen her with her twins and Rodriguez's daughters wishing A-Rod happy birthday.

"Celebrating you today and everyday my love... you are one of a kind, my hurricane and my calm in the middle of the storm...thank you for being such a beautiful light in my life... wishing you the most beautiful birthday ever!!! HAPPY BIRTHDAY 13!!!," Lopez wrote.

Lopez celebrated a milestone on Wednesday when she turned 50.