The singer songwriter behind this year's soulful "fuck You" , and "I always liked that" made the confession on the Else talk-show on Norway's TV2 channel.
"If she is out there watching - I'm sorry! I have to come clean," Mena said.
According to Mena, an older woman she met at a party simply assumed she had been pregnant, and she then found herself unable to tell her the real reason for her unusually bulky shape.
"Hey, Maria Mena, you look so good for the time!" the woman told her. "You've probably just become a mother."
"I didn't have the heart to say 'no'," Mena told Else. "So I said, 'Yes, I've become a mother'. Then she asked if it was a boy or girl."
Before Mena knew what she had started she was discussing her imaginary daughter 'Mino', a name she invented on the spur of the moment.
"I never meant to lie, but Mino does not exist. I didn't have the heart to say that I was just fat," she said.