Pop star Pink fears her husband is onto her efforts to snoop through his phone for clues about his secrets.

The Trouble singer was asked if she ever scrolls through Carey Hart's cellphone when he's not around during a pre-taped appearance on pal Ellen DeGeneres' daytime chat show, and admitted she does it "all the time".

But she thinks he knows.

"The code changes a lot," she chuckled, revealing she can always figure out what it is.

During the TV chat with Ellen, which aired on Wednesday (06Sep17), Pink also revealed she has had sex in a public park. Fellow guest Reese Witherspoon confessed she had also had sex in a public place, but she refused to go into details.