March 7, 2008 — WHILE most pregnant starlets cruise around LA or New York proudly showing off their growing bellies, there’s one expecting actress you won’t see. “The OC” hottie Kelly Rowan is “in the final weeks of her preg nancy,” says a Canadian spy, but is being forced to remain undercover in Montreal because her bil lionaire boyfriend, David Thomson, is “horrified of any publicity.” Thomson is Canada’s richest man and ranked by Forbes as the world’s 10th richest billionaire. He and Rowan are said to be getting married after the April delivery of their kid and, “while [stay ing out of public view] has proven very trying for Kelly, who loves the attention like any normal Hollywood celebrity, she’s willing to give in to her man for fear of ending the whole relation ship,” our source e-mailed. “But she’s just thrilled to have conceived at all in her 40s and to have snagged such a rich prize as Thomson.” Thom son left his second wife while she was pregnant with their first child for Rowan. He has three kids with his first wife.