"My heart is devastated," wrote Beto Cuevas. "All my prayers are with you, Jenni, and your family."
Fans and celebrities took to social media to mourn the singer and television star.
"Spent some time with Jenni Rivera recently. What an amazing lady ... Cool, smart, funny & talented. Such a travesty ... God Bless her family," actor Mario Lopez tweeted.
Mexican singing sensation Paulina Rubio was inconsolable on Twitter.
"My friend! Why? There is no consolation. God, please help me!" she tweeted.
Rivera performed at a concert in Monterrey on Saturday night before boarding the Learjet, which took off early Sunday and lost contact with air traffic controllers about 60 miles into the trip.
Just hours before she died, Rivera opened up to reporters about her divorce and the inner strength she found, thanks to her family.
"I'm so happy. So many strong things have happened in my life. I can't get up in the negative, which destroys you," she said.
"I have brothers. I have children. I have nephews. And they keep me from focusing on the negative."