Tom Cruise and Jeremy Renner are both doing some serious acting -- jumping into an incredibly cold river while filming wild and spectacular scenes for Mission Impossible IV, and Breaking Celebrity News.com has all the bone-chilling pictures.

Currently filming on location in Prague, Czech Republic, the fourth Mission Impossible installment once again follows Cruise as IMF agent Ethan Hunt on a dangerous assignment.

The cast and crew have been in Prague for the past few weeks. Tom's wife Katie Holmes and their daughter Suri visited the set late last month.

Ving Rhames, Simon Pegg, Paula Patton and Josh Holloway are also in the action-adventure flick which is set for a Dec. 16, 2011 release