Cops barricaded guests inside a fancy Upper East Side party while vice president-elect Mike Pence’s motorcade shuttled him to his hotel.

The party at tony furniture store Christian Liaigre — which is opposite the garage of the Loews Regency Hotel, where the veep-in-waiting’s staying — was winding down on Thursday night when police pushed crowd-control barriers right up against the storefronts across the street to keep the area clear while the Secret Service prepared for Pence’s arrival at the hotel.

We’re told that a catering manager announced that the party would be extended for an extra 30 minutes until Pence was safely inside, and the bar was (wisely) reopened.

While one guest told us that some partygoers were irritated to have their plans interrupted and asked cops why they couldn’t leave, another said, “There are worse things than being locked in a room with free Champagne . . . It was kind of fun, actually. There were so many police cars with their lights flashing that it lit up the room like a disco!”