Katherine Heigl is making me dizzy.

One minute she’s blonde, then brunette, then blonde, now back to brunette again.

I prefer her as a blonde, but she did look stunning yesterday for her appearance on “The Late Show With David Letterman”.

I really appreciated this bright yellow Jenni Kayne Spring 2010 dress as summer officially came to London this week.

I love the black accessories which included black bracelets and black YSL Tribute sandals, but the pearls didn’t make sense with this look.

On Letterman she talks motherhood ‘Grey’s Anatomy’ and how she can no longer bring herself to watch the show.

Credit: Style.com & Fame Pictures