So sweet!

Doting father-to-be Evan Ross was this week spotted tenderly rubbing pregnant wife Ashlee Simpson Ross' bare baby bump as she sunbathed in a bikini during a romantic holiday in Hawaii, where he had proposed to her more than a year ago.

The 26-year-old 90210 alum, The Hunger Games: Mockingjay actor and singer the 30-year-old pop artist and actress, who starred on the short-lived Melrose Place reboot, wed last August in Greenwich, Connecticut at the home of Evan's mother, iconic singer Diana Ross, 70, who also officiated the ceremony. Ashlee's sister Jessica Simpson, 34, served as the maid of honor.

E! News learned about Ashlee's pregnancy in December and learned this past February that she is expecting a baby girl. This will be the first child for Evan and the second for his wife, who shares a 6-year-old son, Bronx Mowgli Wentz, with ex-husband Pete Wentz, 35.

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