Her hump, her hump, her lovely little hump is about to go under the knife -- 'cause Fergie has arrived to an L.A. hospital and is moments away from giving birth to her son via C-section ... TMZ has learned.
Sources close to the couple tell us Fergie and husband Josh Duhamel arrived to the hospital together and are prepping for the procedure ... which was pre-scheduled to take place today.
We're told Josh is being super chill about the whole thing ... and was seen chatting it up with the staff while Fergie gets ready to deliver their first child.
Our sources say the 38-year-old singer will recuperate in style afterward ... staying in one of the V.I.P. suites famously used by celebrities like Kim Kardashian and Dwight Howard.