"Here's the thing. I did what I had to do, right? My jumper couldn't zip up," she said to the outlet. "No one knew I was pregnant. I just told my stylist, 'Make sure it's stretchy.'"
"So the undergarment was stretchy and this was baggy, but you know, the zip. It just stopped right there! So it had to be what it had to be."
The performance broke records as it became the most watched halftime show in Super Bowl history.
Rihanna gave birth to her second son, Riot Rose, in August. She gave birth to their first son, Rza the prior year.