Bombshell alert! 90 Day Fiance star, Sierra, has revealed she’s become a mother on the Tell All, as she faces relationship issues with Rob Warne. It comes since she announced they had split. Sophie Sierra from 90 Day Fiancé is no longer be together with Rob Warne, but she’s found happiness by adopting a little “son” instead. The TLC star told her followers, “Guys, I’m officially a mother.” Sophie Sierra becomes a ‘mother’Sophie Sierra has become a mother, which shocked 90 Day Fiance Tell All viewers. However, she was talking about her new pooch, a Maltipoo, a mix of toy poodle and Maltese, ami…