"Prayers and love to @selenagomez you are a warrior princess. What an inspiration," Gaga wrote on Instagram.
As Selena continues her own recovery, Lady Gaga is overcoming health struggles as well.
Earlier this week, the "Born This Way" singer announced on Twitter that she had to cancel her Rock in Rio performance under doctor's orders.
"I was taken to the hospital its not simply hip pain or wear and tear from tour, I'm in severe pain," she wrote on Twitter. "I'm in good hands with the very best doctors.