Britney Spears’ Las Vegas concert dates have reportedly had “disaster” sales.

The 31-year-old singer recently announced a two-year residency at the Planet Hollywood Resort and Casino on Sin City’s famous Strip.

But sales allegedly got off to a bad start, as Radar Online writes that the first 16 shows from December 27 to February 22 have only a few sold-out gigs.

“After spending hundreds of thousands on promo, they expected to instantly sell out all of the first 16 shows, but they didn’t come close!” a source told the website.

“In fact, Britney only sold out three of the 16 shows put on sale and many are considering this a disaster.”

Promoters are supposedly comparing the rates to stars such as Celine Dion and Shania Twain who sold out their first block of shows immediately.

Now concert investors have been getting worried about the money coming in.

“There are nearly 50 shows a year and the theatre is small…it only holds about 4,500 people,” the insider continued.

“So all of this put together really isn’t looking well for Britney. Ticket sales need to start skyrocketing or else there’s going to be a lot of disappointed investors and people involved with the show.”

Britney is being paid a reported $15 million for each year of her Britney: Piece of Me residency meaning she’ll rake in at least $30 million in total.

Although she is getting a large sum for the work, she may not sing live during the 90-minute gigs where she will perform 21 of her hits, according to reports.

“Britney does not sing. She is being paid a lot of money to lip-sync,” a source told New York Daily News’ Confidenti@l column. “Her fans are none the wiser, but it is disingenuous of her to take their cash and not deliver a proper performance.”