Katy Perry had ''no life'' for six months before the Super Bowl.

The 'Dark Horse' singer gave a 12-minute performance during the half-time interval at the NFL game between the New England Patriots and Seattle Seahawks on Sunday (01.02.15) and though her set was much shorter than her usual shows, it required a lot of preparation.

She said: ''We love this opportunity, but once you decide you're gonna do the Super Bowl, you're gonna have no f***ing life for six months.''

The 30-year-old beauty admits she was very nervous about the performance - for which she was joined on stage by both Missy Elliott and Lenny Kravitz - and dreaded reading reactions afterwards.

She said: ''It is the biggest thing. Anyone that's ever done it has been scared s**tless. You stay off the Internet for the five days afterward.''

As well as undergoing a lot of rehearsal, the 30-year-old singer found preparing for the performance tough because she couldn't be the ''boss'' and take full control of everything.

Speaking to the new issue of America's ELLE magazine, she said:

''In my show, I am boss daddy. I am boss mommy. They call me 'Boss'.

''Everything goes through my eyes; I call all the shots, 100 percent of it.

''With the NFL, I have to be accountable to several levels of red tape. There are many committees I have to go through for my costumes, the budgets of my show, every interview -- everything, I have to report to somebody. So I am no longer the boss; I have to relinquish that control.''