Marc Anthony isn’t just on good terms with his estranged wife Jennifer Lopez … he’s also on good terms with the guy who’s bangin’ her … at least judging by this photo. TMZ has obtained a photo of Casper Smart in a great, big bro hug with Marc at a private airport in NY yesterday. We’re told the kids — Emme and Max — have been hangin’ with J.Lo and Casper during the most recent leg of Jenny’s international tour … and when they arrived back in the States on Monday, daddy was right there to greet them. Sources tell us … things seemed very friendly and the kids appeared happy to see their dad. TMZ