Like a princess
Aw, it's so sweet of Mel and Linds to help Deb prepare for her date. Also, since Deb did Mel's (and probably Lindsay's) hair and makeup for her wedding and made Lindsay's dress, it's kinda like they're repaying the favor by prepping her for her date. (Another princess reference!)
L: Don't be nervous. D: I'm not nervous I've got everything under control. M: The front door's that way.
Lol! Aww poor nervous Deb. Carl's mightily impressed though. The girls depart and leave the two lovebirds alone ;)