Hilary Duff has sparked rumors of a romantic reconciliation with her ex-husband Mike Comrie after they were photographed sharing a lingering kiss goodbye.

The singer/actress split from former ice hockey player Mike in January, 2014, after four years of marriage, and they finalized their divorce in February (16).

But Hilary and Mike have always maintained their separation was amicable, and they have remained friendly as they co-parent their four-year-old son Luca, even enjoying a family vacation together following their divorce.

However, the So Yesterday singer appears to have grown close to Mike, 35, once more after spending time with him in Beverly Hills, California on Sunday (15May16), when they shared what appeared to be smooch on the lips as Hilary prepared to drive off.

The 28-year-old has yet to comment on speculation suggesting the former couple is back on, but she has always had nothing but good things to say about her ex.

"We are good friends and we laugh a lot," she shared with talk show host Ellen DeGeneres in January (16), "and we have a great communication and we share pictures when one is not with Luca. He's (Mike) great, we are great and we keep on trucking."

Hilary also expressed her pride at how well she and Mike had handled their marriage split.

"It wasn't working well enough to stay together, but there was still a lot of love involved," she recently told Cosmopolitan magazine. "It was just a slow set-in of us not being the match that we used to be. I'm lucky for the person he is and I am, and how we decided to handle this."