JENNIFER LOVE HEWITT is inching closer and closer to marriage!

The adorable actress is testing the waters of commitment by having her boyfriend and “Client List” co-star, Brian Hallisay, move into her swanky Los Angeles penthouse.

“Jennifer has totally flipped for Brian,” a longtime friend told The ENQUIRER. “She firmly believes he’s ‘the one’ and she’s determined not to let him get away.

“She said, ‘I want to wake up next to him every day! So I told him he should just move in!’”

 Jennifer, 33, and Brian, 34, first met on the set of “Love Bites” in 2011, but didn’t start dating seriously until early last year.

The former “PARTY OF FIVE” star has gone through a star-studded series of boyfriends over the past decade. She’s been linked to former “Blossom” child star Joey Lawrence, talk-show host Carson Daly, singer John Mayer, “Bachelor” Ben Flajnik, her “Ghost Whisperer” co-star Jamie Kennedy, actor/director Alex Beh, as well as another “Client List” co-star, Colin Egglesfield.

But her most serious romance was with Scottish actor Ross McCall, whom she met when he made an appearance on “Ghost Whisperer” in late 2005. The two became engaged two years later, but ended up splitting in 2008.

“Jennifer has a history of falling for many of her male co-stars,” said another source. “The problem is that things usually fall apart for her just when the relationships start getting serious. But she really believes that, with Brian, things are going to be different this time around.”