Skinny Nicole Richie Shows Some Side-Boob Sexy Sheer Top

Nicole Richie just got back from St. Barth and she's already back to work! And while she's no longer in a bikini, she still turned heads in a hot see-through top and pant combo.

The slender starlet appeared on Jimmy Kimmel Live! last night, and she chatted about everything from hubby Joel Madden and the songs he's written about her (some good, some bad!) to how she'd react if her kids wanted to get tattoos like their dad and uncle.

Of course, she also discussed the second season of Fashion Star and whether she feels any sort of competition with fellow mentor Jessica Simpson ... check out her interview clips below!