Kendall Jenner, Jordan Clarkson -- Seems Like Fireworks to Us (VIDEO)

Kendall Jenner and Jordan Clarkson were tied at the hip Sunday ... first hanging at Kendall's new Hollywood Hills pad and then making a run for the Bev Hills Hotel.

They've been spotted together before, but it's increasingly looking like Jordan, who just signed a mega-deal with the Lakers, will be spending a lot of time in the hills.

As for why the went to the Bev Hills Hotel ... we're guessing they grabbed some grub at the Polo Lounge.

TMZ broke the story ... Kendall just bought a $6.5 million pad above the heart of the Sunset Strip.