Kelly Rowland shared that spoiling Beyoncé and Jay-Z‘s gender reveal for Blue Ivy was her biggest mistake calling it the “worst moment ever”.The former Destiny’s Child singer discussed the moment on Billy Mann’s Yeah, I F**ked That Up podcast. She explained how she didn’t realise that she had revealed the gender until she saw the headlines circulating the next day.“Oh my God. When I made a mistake and told the sex of (Beyoncé)’s baby when she was pregnant with Blue,” Rowland told Mann after being asked about her biggest mistake.“That was the worst moment ever.