The Forgotten One by Catherine Bybee

Sarah McNeilly is a rare find in the tabloid industry. She won’t ignite gossip. She finds the truth. And for once, that’s what her boss wants. With her job on the line, Sarah’s latest assignment is to identify the elusive “Maximillian Smith,” unearth his connection to the billionaire Stone family, and dig up some dirt.
Yesterday Max was an ordinary workingman, concerned with little more than the price of gas. Now he suddenly has a family, jaw-dropping wealth, and an avid (if clumsy) reporter on his trail. With the press threatening to destroy his new life, he needs to release his real story strategically, and Sarah is the key—not to mention an adorable yet invaluable resource for finding his mother.
As Max and Sarah team up to peel back the ugly layers of Max’s past, they stumble heart-first into their fiery attraction. But when their research threatens their newly built trust, it’s their future that is on the line.