The terminator needed a tune-up!

Arnold Schwarzenegger underwent emergency open-heart surgery yesterday at Cedars-Sinai hospital in LA, TMZ reports. The procedure was somewhat "experimental" and the star developed some complications, but he is now in stable condition and recovering.

The former bodybuilder needed a catheter valve replacement, but doctors quickly realized it was going to fail and moved forward with a more invasive operation.

The Austrian powerhouse had an aortic valve replaced in 1997, and maintained that his health issues were congenital, and not the result of steroid usage.

Get well soon, Arnie!