07/29/2013 at 11:45 AM EDT
Pretty in pink!
looked happy and healthy at an NBC press event in Beverly Hills on Saturday, rocking a knit minidress that flattered her slimmer figure.
judge, 32, is back to work
on the singing competition for the upcoming season after taking a break
, which allowed her time to focus on herself.
“Without the grueling production hours Christina can focus ... most importantly on herself,” a source told PEOPLE in March
, adding that she had been eating healthy foods and trying new exercise routines.
"It's amazing what having some personal time can do not only for the body but also for the mind and the spirit," the source added.
"I've been through my highs, I've been through my lows," Aguilera has said of the focus on her figure
. "Being too thin. Being bigger. I've been criticized for being on both sides of the scale. It's noise I block out automatically."