Gia Allemand, who appeared on season 14 of The Bachelor, has died.

TMZ says Gia hanged herself and that her boyfriend, NBA player Ryan Anderson, found her hanging and unconscious in her home and immediately called 911.

The 29-year-old model was hospitalized in New Orleans on Monday and placed on life support. Earlier this week, a friend tweeted that Gia was "barely breathing" and the cause was "unknown.

Gia’s Mom and boyfriend were at her side when she died.

Joe Corrigan-Getty Images

After hearing the news, celebrities took to Twitter to express their sadness:

Jake Pavelka -I had to pull over, I can't stop crying. We have lost an angel.

Sean Lowe-My prayers go out to @GiaAllemand 's family during this time. Life on earth is but a vapor and she's with our Lord now.

please join me in sending thoughts & prayers 2 @GiaAllemand 's family & all those who were blessed 2 know her.

Melissa Rycroft- So sad and scary to hear about @GiaAllemand...sending love, strength and prayers to her and her family....

Molly Mesnick- Such a sad, prayers, and thoughts to Gia's family and close friends :(

Vienna Girardi- Gia you are my angel! You changed so many lives with your beautiful soul and will be missed and loved forever.

Justin Rego-I honestly dont know what to say right now.. giaallemand you will be missed and remembered by family,…

DeAnna Stagliano- Sad to hear @GiaAllemand passing. Thoughts & prayers go out to loved ones, family members, & all that were close to her. God got an angel.


Joe Corrigan- Getty Images

Jason Mesnick- My heart is so heavy right now, I remember meeting you for the first time & the huge smile on your face. You are in my prayers @GiaAllemand

Pia Toscano- I am absolutely gutted to hear about Gia Allemand's passing.. Such a stunning person.. Sending all of my love & prayers to her family.

Laura Saltman- Incredibly sad to hear about the passing of Gia Allemand. She was lovely. I know the whole bachelor franchise feeling such sadness today.

Richard Roeper- Sad. 29 is a half-century too soon, at least. Condolences to family and loved ones of "Bachelor" star Gia Allemand.