Who gon’ check her, boo? Shereé Whitfield was spotted hanging out with her Real Housewives of Atlanta costar Porsha Williams’ soon-to-be ex-husband despite the two being locked in a nasty divorce feud, RadarOnline.com has learned. Whitfield didn’t even try to hide the hangout, which went down at an event in Atlanta on Monday night. Wearing a low-cut bodysuit, jeans, and heels, the Bravolebrity looked thick as thieves with Simon Guobadia as she posed alongside him and smiled as if they were old pals.Simon’s caption solidified the seriousness of their friendship and seemed to fire shots in his estranged wife’s direction.”Great…