The former Simple Life starlet has been busy the past few days!

Nicole Richie spent the weekend with her two adorable kids, Harlow and Sparrow, and took the tots to a Beverly Hills park for some fun in the sun.

Then it was off to NYC to co-host The View with Whoopi and company - Richie put in her two cents when the subject of Charlie Sheen was brought up in Hot Topics. "I don't think he should make it somebody else's responsibility to keep him sober," said Nicole. "He's an adult and he needs to take responsibility for his actions."

And now the mother of two is back on the west coast and here she is gyming it up in Studio City after an intense workout session. Lookin' good, Nic!