Of course, the sight of the pretty pair locking lips doesn't come as too much of a surprise.
After all, the two have been pretty inseparable recently.
One day earlier, the lovebirds were spotted strolling hand in hand at the Sundance Film Festival in Park City, Utah. as they made their way to a screening of A Most Wanted Man starring Philip Seymour Hoffman and Robin Wright.
And on Saturday, Jan. 18, Cooper brought Waterhouse as his date to the 20th Annual Screen Actors Guild Awards in Los Angeles, where the 22-year-old model showed some mild PDA by sitting on the American Hustle star's lap at one point during the ceremony.
Although, if last year is any indication, his mom Gloria may just end up being his plus one again.