1000-Lb. Sisters star Tammy Slaton found a spark with a woman named Andrea, whom she allegedly started seeing months after her late husband Caleb Willingham’s sudden death. A source close to the TLC personality, who identifies as pansexual, said Slaton first crossed paths with Andrea not long after Caleb’s funeral last July and to this day is still “dating the same girl,” RadarOnline.com has learned. Slaton is claimed to be “happier than ever,” a tipster told The Sun, adding that Andrea enjoys her privacy and has decided to keep away from the reality show cameras. According to the report, Andr…