“They’re both more private,” explains a source close to Jenner, who celebrated the Fourth of July with the Lakers’ player at Bootsy Bellows’ Malibu pop-up party. “When they’re out in public, they are never all over each other.”
Indeed, the pair kept any PDA to a minimum at the Los Angeles hotspot’s “Red, White and Bootsy” bash, but the source says Jenner and Clarkson’s “relationship has been getting stronger over the last couple of months.”
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“They’re very openly affectionate when they’re comfortable … with friends or alone on a date,” says the source. “They enjoy low-key dates like quiet dinners where they won’t be bothered.”
And though another insider recently told PEOPLE their relationship wasn’t completely “serious” yet, the source adds the duo – who have been linked since March and also attended Coachella together – are definitely heating up.
“They really like each other and Jordan is super into Kendall,” says the source.
Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!