Word on the curb is that Beyonce and Jay-Z are the proud parents of a baby girl!

Several celebs have tweeted congrats to the Carters, including Rihanna and Russell Simmons:

According to several online sources, Queen B checked into Lenox Hill Hospital on 77th street in NYC under the alias Ingrid Jackson and The Carters quietly welcomed their daughter into the world via scheduled C-section Saturday night (January 7, 2012).

Details…

According to the NYDailyNews

A very pregnant Beyonce checked into the upper East Side hospital Friday night under the name ?Ingrid Jackson,? a hospital staffer told the Daily News.

Beyonce and her hip-hop hubby, Jay-Z, rented out the hospital?s entire fourth floor for $1.3 million, the employee said.

In an effort to keep images from leaking to the public, hospital workers placed tape over security cameras and are forcing employees to turn in cell phones when they arrive for their shifts, the source said.

Several security guards were spotted patrolling the outside of the hospital Saturday night.

A Lenox Hill staffer confirmed that a patient named Ingrid Jackson was in a ?labor room.?

Reps for the power couple did not return requests for comment.

The 30-year-old singer was last seen Thursday when she was photographed leaving a Manhattan apartment building wearing hip-hugging jeans, gold heels and a patterned scarf masking her belly.

The couple have reportedly named their bundle of joy “Ivy Blue Blue Ivy Carter.”

[Sidebar: Wasn’t Blue Cantrell Jay-Z’s ex? Hmmm?]

Congrats to The Carters!? Now the bidding war for the first pics begins…