'Bachelor Wedding' Sneak Peek: Sean Shops for Lingerie [Exclusive Video]

Dru Moorhouse
Yahoo TV

In case you haven't heard, "The Bachelor" star Sean Lowe has big plans this weekend.

On Sunday, he's tying the knot with Catherine Giudici, to whom he proposed in the reality series' 17th-season finale.

The reality couple's lavish nuptials will be broadcast live on ABC (because of course), but the bridegroom-to-be might be more eager about what happens after the cameras turn off and their guests go home.

"It's going to be an amazing day, we're celebrating our love, but I'm also really excited for the wedding night," he says before paying a visit to intimate-apparel boutique La Perla.

[Related: Catch Up on the Current Season of 'The Bachelor' With Our Recaps]

"I have never shopped for lingerie before," he admits in this exclusive preview, "so I don't know what to expect."

He is pleasantly surprised by the offerings — like a full-caged bodysuit and "easy access" teddies — and so is Catherine, who can't contain her giggles when she unwraps his purchases.

"Red! You chose red!" she laughs about the predominant color — just like the blooms he bestowed during every "Bachelor" rose ceremony.

"The Bachelor: Sean and Catherine's Wedding" airs live on Sunday, Jan. 26 at 8 p.m. ET on ABC.