"Happiest moment of my LIFE. I am marrying my best friend I [wouldn't] choose anyone else. I am so lucky and so grateful," Hogan captioned her photo of the proposal on Instagram.
Hogan and Costa, both 25, got engaged on the balcony of the Bellagio Hotel in Las Vegas.
"I look scary, but this is the face of total SHOCK," Hogan wrote in another photo.
Hogan, who currently works for TNA wrestling, appeared with her family on the VH1 series Hogan Knows Best and then starred in her own spin-off, Brooke Knows Best. Costa plays football for the Dallas Cowboys.