Summer Clyburn, 22, had just become a mother to a baby girl with her partner Michael Gracia.
Mr Gracia was shot in the head by crazed gunman Stephen Paddock as he opened fire into a crowd of country music fans from the window of his Vegas hotel.
Ms Clyburn then acted as a human shield to Gracia as he lay on the ground, and was shot just under her right shoulder blade.
Her brave actions may have saved her partner.
Mr Gracia made it to the Sunrise Hospital & Medical Centre and underwent successful neurosurgery.
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The 24-year-old police officer is now in a “critical but stable condition”, according to friends.
Ms Clyburn fortunately also survived the brutal mass shooting, and has been pictured on Facebook walking around the hospital holding her three-month-old daughter.
Friends of the couple have set up a GoFundMe to cover the couple’s medical bills, which have already reached £45,000.
Jesse Rivera, a friend of Mr Garcia and Ms Clyburn, started the page to help them.
He wrote: “Michael was shot in the head and was taken to surgery where it was successful but he’s going to have a long road of recovery.
“Summer, his girlfriend and mother of his child, covered him while he was hurt which got her shot as well.
“The love between those two are real and they are new parents and new parents shouldn’t be going through this.”
A total of 59 people were killed and around 530 injured in the mass shooting in Las Vegas, the deadliest in modern US history.
The 64-year-old gunman, local resident Stephen Paddock, fired on crowds at the Route 91 Harvest festival on Sunday from the Mandalay Bay casino and hotel overlooking the world famous Strip, raining down bullets from a 32nd-floor window for several minutes before killing himself.
About 22,000 people were in the crowd when Paddock opened fire, sparking a panic in which some people trampled on others in their desperate bid to escape as law enforcement officers scrambled to locate the gunman.
Images and footage from the scene showed shocked concertgoers, some with blood on their clothing, wandering the streets afterwards.
The White House has said now is “not the time” to talk about restricting gun ownership in the US.