Blake Lively Penn Badgley Kelly Rutherford Gossip Girl TV show set filming cast crew cameras boom

Beauty Blake Lively looked lovely on the set of Gossip Girl in New York on Tuesday ... lovely, but sad!

We're guessing Blake's feeling blue over parting ways with her new love, Ryan Reynolds. The 24-year-old actress helped Ryan, 35, celebrate his birthday earlier this week in Boston with a bunch of colorful balloons.

But now it's back to the Big Apple, where Blake filmed new scenes for the show with her ex, Penn Badgley!

Though the two dated for about two years, it seems they've both amicably moved on. Penn is reportedly dating Zoe Kravitz, and Blake, of course, enjoyed a summer fling with Leonardo DiCaprio. And moved on with Ryan only a few weeks later.