Margaret Lyons
January 11, 2010 AT 02:50 PM EST

Tonight’s How I Met Your Mother is the show’s 100th episode — it’s a major milestone for any show, but the episode is particularly special for a few reasons. One, it features Rachel Bilson (as maybe, gasp, the mother?), and two, it includes a musical number for Neil Patrick Harris’s Barney Stinson. Eeeee!

Who’s excited for tonight’s episode, PopWatchers? Are you suiting up?

More How I Met Your Mother from EW:

How I Met Your Mother: The stars pick their favorite episodes

How I Met Your Mother: 20 of YOUR favorite episodes

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