Excitement is mounting as the one-night-only Bombshell concert approaches!

The June 8th benefit event for the Actor’s Fund will mark the biggest Smash reunion to date. The show’s stars, including Katharine McPhee, Megan Hilty, Christian Borle, Jeremy Jordan, and more, have spent the past week preparing to perform the extraordinary music of the fictitious Marilyn Monroe musical, written and composed by Marc Shaiman and Scott Wittman.

Playbill gives us an inside look at the rehearsals with some fantastic photos of Katharine and Megan. The leading ladies have been working closely with award-winning choreographer Josh Bergasse to master dance routines for fan favorites, such as “The 20th Century Fox Mambo,” “Lets Be Bad,” “Public Relations,” and “The National Pastime.”

Check out pictures of Katharine from rehearsals in the gallery below and head over to Playbill to browse through some more!

Earlier this week, Katharine took to Instagram to share some pictures and videos from rehearsals, including our first look at the dance routine for “Public Relations.” Since then, social media has continued to be abuzz for the big concert. Check out some preparation highlights below!