Carpool karaoke just got even cooler! Iggy Azalea was the latest musician to join James Corden for a spot of karaoke on the way to work — but on top of singing duets to Azalea's biggest hits, the duo went wedding dress shopping together!

After agreeing that Corden could officiate her wedding to Lakers star Nick Young if he became ordained, the Australian-born rapper admitted she had already had a meeting with a wedding planner to start organizing the biggest day of her life.

"Do you think you're going to become a Bridezilla?" Corden asked his guest. "No," she replied, sweetly, before spilling some serious details about what she and Young have planned for their big day!

"Nick wants to have R Kelly perform at our wedding so he can sing 'Marry the P---y' at our wedding," she revealed, before adding that she'd already picked out her bridesmaids. "[I'm going to have] four bridesmaids," she said. "Literally everyone I'm friends with. Demi Lovato's going to be one of my bridesmaids," she added.

All the talk of weddings was too much for Corden to handle, so he pulled over at a bridal shop and offered Azalea the chance to try on a wedding dress for the first time.

"Are we going to push 'em up or let 'em rest?" the cheeky British show host asked, about Azalea's plans for her breasts. "Let 'em rest," she replied, adding that shopping for dresses was "always hard when I have a big butt!"

Watch the whole amazing video above and see what happened when Azalea (and Corden) got a taste of what it's like to be dressed all in white!

Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics, and more!