It’s time to play celebrity matchmaker with Billie Eilish. In “Guess,” her spicy underwear-themed duet with Charli XCX, Eilish teases: “Charli likes boys, but she knows I’d hit it.” The 22-year-old Oscar- and Grammy-winning singer previously opened up about her sexuality to Variety in Dec. 2023, saying “Wasn’t it obvious?” and “I am for the girls.”…