Kim Kardashian, 42, shows off her abs as she trains with Kelly Rowland (Photos)

On Thursday, the 42-year-old reality TV star revealed that Beyonce's former bandmate from the all-girl group Destiny's Child, singer Kelly Rowland, was also 42 and they were working out together.

Senada Greca, Kim Kardashian's new go-to personal trainer, was working with the singer Kelly Rowland.

Kim and Kelly both flaunted their trim figures while working out in all-black outfits that accentuated their lean frames.

The TV star and the singer exercised in a gym for Kim's customary two hours while the TV star, who posted bikini photos to Instagram on Wednesday, lifted weights and did stretches.