Killer Results News Today

♪ hit me baby one more time >> reporter: standing at just 54, the pint-sized superstar and 33-year-old mother of two says she works hard for these killer results. "i started noticing changes in my body. my hips are a little bit wider because ive had kids so it was crucial for me to be continuous with my exercise." whats her secret? spears, seen in this behind the scenes footage, likes to work up a sweat by attending group fitness classes and yoga. and get this, she doesnt have a personal train...