The Olsen twins were never asked to return for the 'Fuller House' finale. Here's how the show got its surprise guests instead.

• Warning: There are major spoilers below for the end of "Fuller House."
• A number of special guests from the original "Full House" attend D.J., Stephanie, and Kimmy's triple wedding, including Danny's ex fiancée, Vicky, Kimmy's ex, Viper, and Michelle's friend, Derek.
• "Most of the people that were sitting there for the wedding pretty much came for free and just sat there because they wanted to be a part of the show. It meant something to them," Candace Cameron Bure, who stars as D.J. Tanner-Fuller, told Insider.
• The Olsen twins do not reprise their role as Michelle Tanner.
• Cameron Bure also called up Joey McIntyre to see if he would officiate the wedding.
• "I said, 'Do you want to be a part of this? Do you want to be in our series finale?' And he was like, 'I would never pass up the opportunity,'" said Cameron Bure.

If you're hoping to see Mary Kate and Ashley Olsen pop up on the final episodes of "Fuller House," which are now streaming on Netflix, don't hold your breath.

"No. We didn't try. It was made very clear to us early on that they did not want to be a part of the show, so that ended," Candace Cameron Bure told Insider on Monday when asked if they attempted to get the sisters to return for the finale, which features a triple wedding for their onscreen sisters D.J. and Stephanie.

The twins played Michelle, the youngest Tanner sister, on the original long-running series "Full House." Though the duo doesn't make an appearance at their sisters' wedding, the finale is filled with many other surprise guests to make the event feel extra special, including the return of Joey McIntyre.

Cameron Bure shared her role in getting McIntyre to appear on the series again and how several actors reprised their original characters for small cameos.

How Joey McIntyre returned to 'Fuller House': Candace Cameron Bure simply called and asked.

Previously seen on season two of "Fuller House," Danny Tanner hired the "New Kids on the Block" singer to officiate D.J., Stephanie, and Kimmy's triple wedding.

"I had a little hand in getting Joey McIntyre," said Cameron Bure. "I sat with our showrunners and we talked about who we wanted to officiate the wedding and we wanted a fun surprise guest."

"I said, 'Well, if you're going to ask me or Andrea [Barber], I know hands down we'd love it to be Joey McIntyre.' So they said, 'Oh, we think that'd be hysterical.' So I said, 'Let me call him.' And I called Joey."

Cameron Bure said it was as simple as asking the singer if he wanted to be in the series finale.

"He was like, 'I would never pass up the opportunity,'" added Cameron Bure. "It was as easy as that. So, we got our first choice. And he was super funny. I loved it."

The moment was a huge payoff.

Earlier in the season, the three couples play a version of "The Newlywed Game" with their kids. All three women mention McIntyre as their first celebrity crush, something that flusters Kimmy's fiancé, Fernando who isn't familiar with the singer.

"They did build that up with the show beforehand," said Candace Bure. "It infused the comedy in that portion of the wedding because we didn't want any big stunts during the wedding."

'There were no background extras at the wedding': How several actors reprised their 'Full House' characters for the finale.

In addition to McIntyre, the finale included many surprise cameos for longtime "Full House" fans. Gail Edwards returns again as Danny Tanner's ex-fiancée, Vicky, David Lipper appears as D.J.'s ex, Viper, and Scott Menville, who played Kimmy's ex-boyfriend, Duane, gets a quick line during the nuptials.

The return of Blake McIver Ewing as Derek Boyd, Michelle's childhood friend, was a favorite of Cameron Bure's. His character winds up auditioning to officiate the triple wedding with a rendition of "The Yankee Doodle Boy."

"I think he was the standout surprise guest. I loved that he came back for it," said Cameron Bure. "We wanted to bring back everyone who was willing to come back."

According to the actress, the producers and writers had an entire list of who they wanted to try and bring back for the finale. They collaborated on who they thought those guests should be. It wasn't tough to get most people involved.

"When they said that, we were like, "Oh my gosh. That'd be so great if he wanted to come back and do a little 'Yankee Doodle Boy,' because he was so funny on the original show," Cameron Bure added of McIver Ewing's return. "I thought he just did a fantastic job. He nailed it. He made me laugh out loud the most of anyone on the finale show."

"And I'll tell you, most of the people that were sitting there for the wedding pretty much came for free and just sat there because they wanted to be a part of the show," said Cameron Bure. "It meant something to them. And there was not one person in our wedding that wasn't either a personal family member or someone that had been on the show, so there were no background extras at the wedding."

The final episodes of "Fuller House" are currently streaming on Netflix. You can read our full interview with Candace Cameron Bure here.