The Billion-Dollar Bride (2005)

She's fallen in love with her husband! Gina Saxton has inherited a huge fortune—on one condition: she must wed the heir to the other fifty percent—arrogant Ross Harlow! However, Ross has a suggestion to make: become his billion-dollar bride for one year, no strings attached. Easy enough—until Gina realizes that her convenient husband finds her hard to resist and she's falling in love with him! But Ross won't let Gina go—he insists they act on the passion simmering between them—and turn their fake merger into a marriage in every sense!