Slade Smiley is engaged to his longtime girlfriend and Real Housewives of Orange County costar, Gretchen Rossi, 34, after she recently proposed, PEOPLE has confirmed.
The popping of the question will be televised on Bravo's hit show.
"They're really happy about getting married," a source tells PEOPLE of the pair. "Gretchen always does everything out of the box, so no one is too surprised she was the one who proposed. She really wants kids with Slade, so that was a big motivator."
Rossi's giant four-carat yellow diamond sparkler was designed by Danny Arik of Newport Jewelers in Newport Beach, Calif., the source says.
Two years ago, Rossi gushed about her now husband-to-be, saying, "Spiritually, emotionally, mentally and physically, [Slade and I] connect on every level. He supports me, loves me and is so unselfish. I just feel like the luckiest girl in the world."
This marriage will be a first for Smiley and a second for Rossi.