Heidi Klum and her ex-husband Seal exchanging pleasantries -- and a cheek kiss -- in public over the weekend ... the first time we've seen them together since their nasty split last year. The two came together in Malibu this weekend to celebrate their daughter's 4th birthday ... and nearly 2 years after they split, it seems they've finally decided to play nice. As we reported, Heidi separated from Seal in January 2012 and filed for divorce in April. Heidi's story was that she couldn't handle Seal's explosive temper. After the split, Seal accused Heidi of banging her bodyguard during their marriage and alleged that's why they broke up. It was pretty bad. But now, it seems that's all water under the bridge. If they can make peace, maybe there's hope for the Dems and the GOP???? Then again, maybe not.