By Lara Walsh
Updated Jun 21, 2016 @ 8:15 am
June 20, 2016
Credit: Splash News

Expectant mom Blake Lively was a vision in blue Monday, when she showed off her growing baby bump in a fitted off-the-shoulder royal blue Cushnie et Ochs number heading to an appearance on the Tonight Show Starring Jimmy Fallon.

The stylish actress has been making the publicity rounds for the shark horror movie The Shallows, which hits theaters June 24, and the 28-year-old beauty looked radiant in the body-hugging blue dress, which showed off a peek at her pregnancy bump with a strategically placed cutout. The flattering sleeve design displayed Lively's toned shoulders and arms and her Christian Louboutin stilettos complemented her long legs.

The Gossip Girl alumna ensured all eyes were on her radiant skin by keeping the rest of her look simple, opting for minimal gold jewelry and a bronzed makeup look with thick lashes. The star pulled back her famous blonde beach waves into a casual high ponytail to complete her Tonight Show-ready ensemble.

Meanwhile, in the studio, Lively and host Jimmy Fallon couldn't resist getting competitive over "Know It All," a game to determine which contestant could name more things in different categories. The mom-of-one thought she had it in the bag after ace-ing the Harry Potter characters section. That is, until Fallon hilariously chose the Spanish words category, and the actress was left at a total loss!

Watch the hilarious game in the video above.