They may still be a down-low duo, but Alex Rodriguez and Cameron Diaz’s friends are spilling the beans on their red-hot romance! “They’re cute together. As long as they’re happy, that’s most important,” Amber Sabathia, the wife of A-Rod’s fellow New York Yankee CC Sabathia, told In Touch about the superstar sweethearts at a birthday party for her husband in Jay-Z’s 40/40 Club on July 18. Though Cameron and her baseball player beau passed on any PDA inside the Big Apple bash, they were obviously a pair. “They were mouthing to each other from across the room,” a source says, adding that the actress seemed comfortable with Alex’s friends and partygoer Beyoncé. Cameron and A-Rod have been quietly dating since reportedly hooking up in February.