"We're so thrilled and happy to start a family," she tell Us in a statement.
The star, who is reportedly three months along, has always wanted to be a mom. "I would love to to have babies," Jennifer has said. "I'm obsessed with babies!"
The happy couple has been dating for about 15 months—they first met when they worked together on the ill-fated Love Bites in 2011, but they didn't date until the next year when they began costarring on the Lifetime show The Client List. Brian proposed last month while they were vacationing in Europe.