Brooke Shields spent some time with the little ladies in her life on Satuday afternoon (August 1) while in Boston, MA.

The 44-year-old actress was actually on her way out of Beantown with her daughters Rowan and Grier Henchy on the train when the shutterbug spotted them saying goodbye to a possible grandmother as they made their way into the station.

Meanwhile, when asked by People mag about how she stays in such killer shape, Brooke said: “I’m a closet superhero.”

Her real secret? A combination of yoga and spinning. No dumbbells for her, thank you. “It’s not safe for me to work with weights at the moment because I just get a bit … I respond quickly.”