The 20-year-old model shared a photo of the moment Wednesday, telling fans that the surgery had been a success.
While it's still unclear what Shriver was in surgery for, he seems to be in good spirits as he's continued to tweet photos from bed and give thanks to "the best nurse ever," his mother, Maria Shriver.
No one puts my socks and shoes on better than @mariashriver hahha. Love u mamma— Patrick Shriver (@PSchwarzenegger) April 17, 2014
2014: The Year in Music [PHOTOS]