Rob Reiner’s son Nick asked A-listers strange questions at Conan O’Brien’s Christmas party hours before the screenwriter allegedly killed his parents.

“What’s your name? What’s your last name? Are you famous?” Nick asked actor Bill Hader at the holiday bash, according to the Wall Street Journal.

Rob had introduced his troubled son to the “It Chapter Two” actor, 47, earlier at the party.

Rob Reiner’s son Nick (second from right) asked A-listers strange questions at Conan O’Brien’s Christmas party the night before the screenwriter allegedly killed his parents. michelereiner/Instagram

“What’s your name? What’s your last name? Are you famous?” Nick asked actor Bill Hader (above) at the holiday bash, according to the Wall Street Journal.  BACKGRID

Rob had introduced his troubled son to the “It Chapter Two” actor, 47, earlier at the party. Getty Images for Teen Vogue
The “Being Charlie” writer, 32, also pestered other partygoers with the same questions and was eventually asked to leave.

Hader’s rep had no comment. Reps for O’Brien did not respond to Page Six’s requests for comment.

During the festivities, Rob and his wife, Michele Singer Reiner, allegedly got into a “very loud argument” with Nick.

“They had had an argument at Conan’s holiday party, and Rob had been telling people that they’re scared for Nick and scared that his mental state was deteriorating,” a lifelong family friend, who lives near the Reiner home, told The Post.

The “Being Charlie” writer, 32, also pestered other partygoers with the same questions and was eventually asked to leave the comedian’s home (above). 4CRNS, WCP / BACKGRID

During the festivities, Rob and his wife, Michele Singer Reiner, allegedly got into a “very loud argument” with Nick. The longtime couple left the party after the confrontation. Brent N. Clarke/REX/Shutterstock

Sources told People that Nick was allegedly “freaking everyone out, acting crazy” with guests at O’Brien’s party. Variety via Getty Images

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Sources told People that Nick was allegedly “freaking everyone out, acting crazy” with guests at the party.

Another insider told TMZ that Nick stuck out like a sore thumb at the formal soirée because he was dressed in a hoodie.

The day after the party, Rob, 78, and Michele, 70, were found stabbed to death in their home, located in the Brentwood neighborhood of Los Angeles.

Sources told The Post that the couple’s slain bodies were discovered by their daughter Romy Reiner.

Another source told TMZ that Nick stuck out like a sore thumb at the formal soirée because he was dressed in a hoodie. REUTERS

The day after the party, Rob, 78, and Michele, 70, were found stabbed to death by their daughter, Romy Reiner, 28, in their Brentwood home in Los Angeles. michelereiner/Instagram

Nick was arrested on charges of the murders Sunday night. LAPD Gang and Narcotics
Nick was arrested on charges of murder Sunday night. He is being held at LA’s Twin Towers Correctional Facility without bail. An arraignment is scheduled for Jan. 7, 2026.

The nepo baby openly battled with drug addiction since he was a teen and had a reputation for violent behavior.

Nick reportedly went on meth-fueled outbursts when his parents threatened to kick him out.