A little bit of Las Vegas has arrived in New York for the holiday season. It takes the form of Donny & Marie: A Broadway Christmas, featuring the sibling performers who have nearly a century’s worth of show business experience between them. While watching this wonderfully cheesy and entertaining confection you can practically hear the whirring and squawking of slot machines nearby.

Although being sold as a holiday entertainment, the show is basically their standard act, with the addition of a handful of Christmas tunes.

It’s easy to see why Donny and Marie, unlike so many child stars of their generation, have continued to prosper in show business. They work hard, extremely hard, to give their audiences what they want. This elaborate production--which begins with the two performers emerging dramatically on risers while seemingly thousands of LED lights pop and the onstage rock band plays furiously--showcases their considerable talents to full advantage.

The brother and sister each take solo turns. Marie proudly demonstrates her vocal eclecticism by foraging into country (her hit “Paper Roses”); rock (“Would I Lie to You”), pop (“Boogie Woogie Bugle Boy”); show tunes (a Broadway medley that’s as exhausting to watch as it must be to perform) and even “opera” (“Pie Jesu” from Andrew Lloyd Webber’s Requiem).

She also brings up a male volunteer from the audience for a steamy duet on “Blue Christmas” that in this case was enlivened by the recruit’s comic eagerness for both the close clinches and an impromptu vocal.

Then it’s Donny’s turn, with his now middle-aged female fans squealing with adolescent excitement. After an all-too-serious rendition of his 1989 pop hit “Soldier of Love,” he delivers a self-deprecating medley of his teen smashes like “Go Away Little Girl” and “Puppy Love.” (Observing his youthful self on a giant video screen, he jokes, “That’s Justin Bieber up there.”) He also performs “Any Dream Will Do” (from the show he toured in for years, Joseph and the Amazing Technicolor Dreamcoat) and the Osmonds’ atypically hard-rocking “Crazy Horses.”

The pair reunites for the final segment, featuring elaborate production numbers showcasing the dance moves they exhibited on their respective turns on Dancing With the Stars. A running gag has Donny proudly commenting on the fact that he won while his sister only managed to come in third.

For all the strenuous effort involved for most of the evening, the most charming moment comes towards the end, when the performers simply sit on stools and sing to a video montage of moments from their careers, including their variety and talk shows. Their kidding comic banter, scripted as it may be, has the relaxed feeling of genuine sibling affection.

Marquis Theater, 1535 Broadway. 877-250-2929. www.ticketmaster.com. Through Jan. 2.