It's tough to decide whom to vote for on Dancing with the Stars all-stars, you all will agree on one thing: season 15 is full of heartthrobs!

From Gilles Marini to Apolo Anton Ohno to Joey Fatone, competitors had viewers swooning on social media Monday night. And once Kirstie Alley planted a surprise kiss on Emmy-winning host Tom Bergeron, the Twitterverse went wild!

Smith and French actor Gilles Marini earned the highest scores of the night-a 24 and a 24.5 for their dynamic cha cha and foxtrot routines, but Alley stole the show when she planted a long, sensual kiss on host Tom Bergeron's lips before exiting the dance floor to learn her scores.

"That's for your Emmy," Alley said to a stunned Bergeron, who has been married to Lois Bergeron since 1982. Last night, Bergeron won an Emmy for his work on the ballroom dance competition show.

Though the judges praised Alley for her "sensuality" and her skill as an actress and performer, they derided her dance technique, especially her carriage. She earned a 19. "Lift up your rib cage. Lift it up," said juge Len Goodman. "The quality of movement wasn't superb."

The judges told the 8-time Olympic medalist in speed-skating that he needed more hip-action, but displayed "exquisite" arm extension. Judge Carrie Ann Inaba told Ohno that he had gotten "three thousand times more sexy" since he first appeared on the show in 2007.

Judge Bruno Tonioli told Anderson she "looks like a girl who could go all the way," but that "there wasn't enough work there for me to really praise you." The judges awarded Anderson a 17 out of 30.

"It was a bit like a kid on a bike when you take the training wheels off," judge Goodman said. "It was a bit shaky."

Tune in to ABC tomorrow night at 8 p.m. to see which all star will be the first celebrity sent packing.

After seemingly endless weeks of grueling rehearsals and memorable performances three couples - Katherine Jenkins and Mark Ballas; Donald Driver and Peta Murgatroyd; and William Levy and Cheryl Burke - were left vying for the coveted mirror-ball trophy during two nights of competition.

And the winners are ... Donald and Peta!

"Amazing!" Donald shouted when asked how he felt by host Tom Bergeron, who handed the couple the mirror-ball trophy as confetti fell in the ballroom and his former competitors from throughout the season congratulated them.

Katherine and Mark finished in second place, and William and Cheryl landed in third. "It was an amazing experience," William said. "I'm going to miss all of you."

"Thank you so much Mark," Katherine told her partner. "It's been an absolute dream." "I had a wonderful time working with Katherine," he said. "She's an angel."

For the final performance of the season, Donald and Peta did crowd-pleasing cha cha that earned - you guessed it! - another perfect 30. Len offered the NFL star this compliment: "We've had some great footballers on the show over the years," he said. "My feeling is you're the best we've had."

Jaleel White and partner Kym Johnson got their groove back with a crowd-pleasing cha cha on Dancing with the Stars Monday - but some other contestants struggled to keep up with the competition. Gladys Knight's rumba Monday night just didn't have the smooth moves of the Temptations or the rhythm of Smokey Robinson. So she and partner Tristan MacManus ended up as one of the final bottom couples, along with Roshon Fegan and Chelsie Hightower, whose rumba wasn't much better.

Gladys and Tristan are heading home.

The singer and her partner faced off in a dance duel with Roshon and Chelsie. After both couples performed a jive, the judges voted. Although Carrie Ann Inaba chose to save Gladys, both Len Goodman and Bruno Tonioli picked Roshon.

"I am just so amazed at this journey. It's been absolutely extraordinary. I learned so many things ... I'm just overjoyed," Gladys said after hearing the news that her time on the show had ended.

Of the remaining contestants, who'll be back on Monday to perform once again, she added, "They are already stepping up way, way, way beyond anything that's ever been on this show."

Melissa Gilbert had the most challenging phase in Dancing with the Stars. She shared the complete incidence with her fans and this is what she had to say:Maks and I had a bit of an accident Monday night. The moment it happened, I had no idea what had gone wrong. My head hurt a lot and I assumed I'd hit it on the dance floor.

Things were spinning a bit for me when the judges gave their critiques. In fact, by the time I got up to the skybox I had no idea what they'd said.

I remember snippets; I remember Gavin carrying me down the stairs. I remember Maks trying to keep me from closing me eyes; I remember some of the ambulance rides, my boyfriend making me laugh through my tears. I remember the X-ray and, boy oh boy, do I remember the headache! I've never had a concussion before. It is not fun. I pray that it's something I never experience again. I must admit though, I'm having a hard time getting my sexy, dancer mojo back. I'm being a bit self-protective, a bit tentative and I'm finding it hard to just let go and have fun. So, that is my goal this week - to let go and have fun.

Yes, I was hurt. Yes, it was scary but, that was then ... this is now ... It's time to believe again!