Now that Suki Waterhouse and Robert Pattinson are expecting their first child together, the actress is holding out hope her boyfriend of five years will eventually get down on one knee. “He’s telling pals he’s looking to propose over the holidays when they will be surrounded by family,” said a source, adding that the Twilight alum, 37, who was previously engaged to FKA Twigs, “has always been marriage shy.” However, the Daisy & the Six star, 31, has been a steady fixture in his life. “He’s been sure about Suki for quite some time, and the fact that she’s pregnant has just moved the clock forwa…