...Alexis Barbara, the property tycoon heiress girlfriend of Mark Philippoussis for the past five months, has just turned 18 - and accepted a marriage proposal from Mark Philippoussis. Her father is Oscar Barbara, a millionaire property developer. According to South Florida CEO magazine, Oscar is the son of Cuban emigres, and worked from age 11 as a newspaper delivery boy, clothing store assistant and boat rental attendant, before he became a successful property developer. He is the president of Quantum Homes and the Builders Association of South Florida.