Who knew a cartel kingpin could be such a doting dad?

Joaquin “El Chapo” Guzman alternated between smiles and tears in court Thursday as he got an early Christmas present — a visit by his 7-year-old twin girls, Emaly and Maria Joaquina.

The cartel kingpin’s wife, Emma Coronel Aispuro, who had been missing from court this week, made a return with the two girls, dressed in matching white blazers, jeans and sporting bows in their hair as they beamed at the sight of their papa.

Guzman — who is accused of running an ongoing criminal enterprise, money laundering, conspiracy, arms possession and international distribution of drugs — couldn’t contain his glee, waving at them and blowing kisses as they were propped up on their mom’s lap to get a better view after not seeing him for several months.

The girls are the only family members allowed to visit the drug lord, as he and Emma aren’t allowed to communicate. He also will get a prison visit with his daughters on Friday.

A marshal stopped the family fun by forcing Guzman to focus on the witness stand, where Colombian national police official Yeson Tapasco Suarez was testifying.

He provided details about the seizure of more than 400 kilos of cocaine in which Guzman had invested, as well as dozens of grenades and rocket-propelled grenades on a plane five years ago.

Yet Guzman continued to steal glances at his daughters, and during a break even motioned for reporters seated in front of them to move over so he could get a better view.

He gave a thumbs-up to the media, and then continued to wave and clap for the girls.

His emotion was so visible that even jurors noticed, with some appearing to turn their attention away from the witness entirely and onto the children, who climbed all over their mom smiled for their dad.

Later, ATF firearms expert Max Kingery walked around the courtroom wielding an AK-47 and a grenade launcher for jurors, showing off the weapons that El Chapo and members of his Sinaloa Cartel allegedly used in their everyday operations while trafficking drugs.

And El Paso, Texas, Detective Paul Lozano explained that his team had followed a suspicious vehicle to a home there in January 2010.

Inside, they found 40 AK-47s, seven bulletproof vests, 80 magazines — and a Christmas tree.