Kendall reportedly attended a Coachella party hosted by Bootsy Bellows and McDonald's alone with her security, joining a bunch of close friends which included both Gigi and Bella Hadid.
Blake, who was already at the star-studded event was said to have walked past Kendall, whom she stared at before whispering to a friend.
Kendall first confirmed that she had been dating the Detroit Pistons star to Vogue since August last year. She told the publication: "I’m happy. He’s very nice, I have someone being very nice to me."
A source although previously told PEOPLE that their romance has since "cooled off".