Jennifer Lopez makes sure she looks glamorous for her children.

Despite her incredibly busy life, the singer-and-actress always makes an effort with her appearance so her two-year-old twins, Max and Emme, know what she really looks like.

She said: "Sometimes (as a mother) you don't even have time to shower, and I totally understand that. My kids need to know what I look like! Make an effort and say, 'OK, I need to get back to the person I was.' "

The 42-year-old star - who is separated from her kids' dad, husband Marc Anthony - has also revealed the iconic green Versace gown she wore to the 2000 Grammy Awards had been worn by someone else first.

The 'American Idol' judge - who was dating rapper P. Diddy at the time - said: "I remember putting it on and the stylist saying, 'You know, somebody else wore this.' I was like, 'I don't care. It looks great.' "