Price, 31, and boyfriend Alex Reid said Wednesday in a statement that they wed in a "simple, private ceremony" in Las Vegas and that they were "very much in love," according to the news agency.
The couple have been dating since July 2009, following Price's high-profile split from pop singer Peter Andre.
Price and Andre had been married for four years and have two children together. Price, also known as Jordan from her modeling days, and Andre also co-starred in the reality show, Katie & Peter, which aired in the states on E! Price also has another child from a previous relationship.
Reid, 34, is a martial arts fighter and won the British version of Celebrity Big Brother just last week.