Nick Reiner, who is under arrest for the murder of Rob and Michele Reiner, checked into a Santa Monica hotel early Sunday morning, and left a trail of blood behind … sources with direct knowledge tell TMZ.

Nick checked into The Pierside Santa Monica around 4 AM Sunday, using his credit card. His check-in came hours after he got into a heated argument with his father at Conan O’Brien‘s Christmas party.

Eyewitnesses who saw Nick check in say he seemed “tweaked out”, but there were no visible signs he had been in a violent confrontation — we’re told definitely no blood stains or cuts on his body.

LAPD Robbery-Homicide detectives went to the hotel Monday to gather evidence and also interview employees.

Nick was eventually tracked down and arrested around 20 miles away in Exposition Park, near downtown Los Angeles.

TMZ broke the story … sources told us Nick was acting very strange at Conan’s party … not interacting with guests, and his attire was out of place … it was a pretty ritzy event, but Nick was rolling around in a sweatshirt and seemed high on something.

The first night of Hanukkah kicked off Sunday, and these celebs are just a few who have shared how they celebrate the Festival of Lights.

From Cindy Crawford and Noa Tishby, to Julian Edelman and Jake Cohen — we’re showing you who’s spinning the dreidel and spending time with loved ones this holiday season!

Andy Cohen braved the cold to light a giant menorah in front of a crowd of onlookers in the West Village.

And ‘Catfish’ host Nev Schulman celebrated in the comfort — and warmth — of his own home, snapping a selfie of himself holding the flames.

Kimora Lee Simmons is clapping back at Russell Simmons after her ex-husband claimed she was using their daughters as leverage to keep him from suing her … she says he has bigger fish to fry.

In her Instagram Story, Kimora sends a shot at Russell, posting … “My ‘girls’ are GROWN WOMEN! You know these are lies. Why are you typing from thousands of miles away in a non-extradition country?”

Kimora is referencing the fact Russell’s lived in Bali since 2017 amid multiple sexual misconduct lawsuits and allegations, which Russell says have caused him great suffering.

Kimora’s post comes in response to a comment made about Kimora’s recent interview with PEOPLE, where she admitted she doesn’t have a relationship with her exes … Russell, actor Djimon Hounsou, or investment banker and convicted felon, Tim Leissner.

Russell claimed Kimora threatened that if he ever sued her, he would never speak to Aoki or Ming again.