Kourtney Kardashian and Scott Disick arrive at LAX airport looking worse for wear after a trip to Tucson

They had been in Tucson filming Keeping Up With the Kardashians.

But by the look of their faces, Kourtney Kardashian and Scott Disick could have done with catching up on some sleep.

The pair kept their heads down as they arrived in LAX on Tuesday, following a heavy night out that saw Scott pour a bottle of vodka over a group of students.

The Hangover Part 4? Kourtney Kardashian and Scott Disick arrive at LAX airport looking worse for wear after a trip to Tucson

Scott, who has frequently argued with his long-term girlfriend Kourtney about his drinking on the reality TV series in the past, reportedly caused 'chaos' when he partied with the brunette beauty at her former college, the University of Arizona in Tucson.

A source told Radar: 'You wouldn't believe the madness that went on last night. The students were ecstatic and it was complete chaos.'

The 30-year-old star was spotted pouring alcohol from an upper terrace at Gentle Ben's pub and cameras captured the entire incident for the couple's E! reality show.

It is the sort of over-indulgent behavior we've come to expect from Scott, who regularly posts pictures of him playing with bundles of cash on Instagram.

It wasn't long before videos of Scott pouring the drink surfaced online, with eager students wanting to share the encounter.

Also fond of a tipple or two, is Kris Jenner, who was seen on the show this year drunkenly vandalizing the family home with toilet paper.

That looks painful: Kourtney appears to be slightly worse for wear after a night out with Scott in Tucson

A bit of a state: Kourtney and Scott certainly weren't looking their best on Tuesday

What happens in Tucson: Kourtney seemed disorientated to say the very least as she was spotted at LAX the day after her night out with Scott

It looks as though Kourtney was well and truly in on the fun during this trip to Tucson however.
An insider recently told Life & Style magazine that Scott, who has a son, Mason, three, and 18-month-old daughter, Penelope, with Kourtney, has allegedly been partying more since the death of his mother, Bonnie, from cirrhosis of the liver in October.

The source said: 'Scott is devastated. Kourtney sees him heading down a bad path again. She's trying to help him through this [and] giving him the sympathy he needs.'

Party people: Scott Disick and Kourtney Kardashian on a night out in Las Vegas earlier this year