The pair were first spotted smooching at an afterparty for Spade's Showbiz Show in March – a month after Locklear filed for divorce from Richie Sambora.
At the time, a source close to the situation told PEOPLE that the longtime pals had been "spending time together," but that things hadn't reached the "dating" stage.
Meanwhile, another friend of Locklear's downplayed any notion of romance. "Heather and David were just goofing off; the whole thing was blown out of proportion," said the pal. "They were joking around and hamming it up, and the next thing you know, people are saying they're together."
Madison-Cooper / X17
Last month sources close to Locklear again said that she and Spade were not a couple, but that Spade had been a source of comfort – and more than a few laughs – during tough times.
Said a pal of Locklear's, "He's been a good friend to her."