Paris Hilton's husband Carter Reum is wearing a Breitling Navitimer Montbrillant Spatiographe.

There are several images of Carter Reum wearing the same watch, so it seems like this is his primary wristwatch.

Reum's Breitling Navitimer Spatiographe watch has a black dial, steel case with a coin bezel, and black leather strap.

The watch is a chronograph watch with two large buttons on each side of the large crown. It has a Tachymeter scale on the inner bezel, two subdials at the 3 and 6 o'clock positions and a date window on the left side of the dial (near the 9 o'clock position).

The logo is the gold colored logo in Breitling script.

With thanks to Razvan for the ID