Whether you’re a little bit country or a little bit rock and roll, Donny and Marie Osmond will have you dancing in your seats (or maybe the aisles depending on whatever you’re sippin’ on) with their 90-minute, feel-good Vegas concert.Singing together on stage for the first time in 1973 during a Las Vegas Osmond show, the brother and sister duo discovered their niche and hit the ground running.And while Donny got his start singing with his six brothers in the family music group, The Osmonds, and while Marie originally achieved solo success when her version of “Paper Roses” hit No. 1 on the Billboard Country Music charts, the two left their roots and joined forces in 1976 to host the ABC variety show, “Donny & Marie.”Still performing together today with every bit of gusto and showmanship that previously sky-rocketed the two into teen stardom, Donnie and Marie’s headlining Las Vegas show takes audiences back to yesteryear while simultaneously indulging onlookers with today’s popular hits.Since opening their show in 2008 at the Flamingo, their family-friendly concert entertains with high-energy numbers such as "Get the Party Started," "Dancing in the Streets" and "Knock on Wood” in addition to a new song, "Vegas Love,” which is off of their latest and first album they have recorded together in 30 years.Following the winning formula of their 1970s TV program by incorporating dancing and humor and performing most of their hit songs as a duo in addition to highlighting some of their career achievements individually, there is not a dull moment in this production.For Marie's turn in the spotlight, she sings her most well-known song, "Paper Roses," along with some of her other country favorites, accompanied by two guitar players.She then takes it a bit slower for a moment when she belts out a flawless rendition of the operatic “Pie Jesu” but then heats things up with a mash up of "Walk this Way" and "These Boots Were Made for Walking," accompanied by male dancers and, of course, elaborate and dazzling costumes.But when it’s Donny’s turn to woo the audience, the set transforms for the performer who was always a little bit rock 'n' roll, and he appears out of the on-stage fog to rock his 1989 comeback hit "Soldier of Love."Donny, a "Dancing with the Stars" winner, shows off some of his moves and some funky choreography in "Yo Yo" while footage of him and his brothers dancing during the '70s plays on a screen behind the stage.Even though Donny likes to rock, it was his love ballads that made him an official heartthrob and he doesn't disappoint the longtime fans, singing well-known hits like "Puppy Love," accompanied by footage of him during his teenage years."This is the part where all of the women would scream," says Donny in the middle of "Puppy Love," which of course, elicits screams from the female members of the audience. "I've still got it!" he proclaims and the audience agrees.Donny and Marie reunite on stage toward the end of the show, singing some of their classic hits like "Make the World Go Away," "Morning Side of the Mountain" and "Deep Purple."The intimate 750-seat showroom at the Flamingo is a perfect fit for Donny and Marie, offering a good view from just about any seat and allowing the performers to walk out into the audience and get close to their fans. The classic Vegas-style room features booths and tables and contributes to the feeling of nostalgia the duo evokes with their show.The Osmonds have both starred on Broadway and they close the show with songs from "Joseph and the Amazing Technicolor Dreamcoat," "Wicked," "The Sound of Music" and more.Donny and Marie have been crowd pleasers in Vegas since childhood and judging by the fact that they're still consistently selling out shows, they'll continue to be welcome for many years to come.