The Insider.com

Just weeks after her real-life wedding, Cobie Smulders is once again preparing to say 'I do' on the season premiere of her hit CBS sitcom How I Met Your Mother.

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VIDEO: Wedding Jitters on How I Met Your Mother

"It just made me exhausted trying on wedding dresses again," said Cobie, revealing her "classic and sexy" TV bridal gown, from Monique Lhuillier's 2011 Spring collection, only to The Insider. "I was like, 'I just did this.'"

The actress' personal gown from her marriage to SNL regular Taran Killam differed slightly, featuring lace detailing with a V-neckline and low back, while her fictional wedding dress also features lace but with an off-the-shoulder neckline.

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Now that the issue of her character Robin's dress is settled, what about her nerves?

"I can't go through with this wedding," says a panicked Robin in an advanced show clip.

And it should come as no surprise that Neil Patrick Harris' character, Barney, has his own hangups.

"I think Barney's a one woman type of guy, just in sequence -- one woman at a time," said Neil.

The season premiere of How I Met Your Mother airs Monday, September 24 at 8/7c.