Missing something? Scott Disick looks downcast while on daddy duty after ex Kourtney Kardashian's wild girls' trip to Mexico

His ex Kourtney Kardashian flaunted her assets on a wild girls' trip to Mexico last week for her birthday.

And Scott Disick did not looked too pleased on his latest outing.

The 33-year-old reality star looked sad while he was on daddy duty as he was joined by kids Mason and Penelope during an outing in Calabasas on Monday.

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Downcast: Scott Disick looked sad while he was on daddy duty as he was joined by kids Mason and Penelope during an outing in Calabasas on Monday.

Downcast: Scott Disick looked sad while he was on daddy duty as he was joined by kids Mason and Penelope during an outing in Calabasas on Monday.

Scott did not have a pleased look on his face as he treated his seven-year-old son and four-year-old daughter to lunch at King's Fish House.

He was definitely a cool dad as he later brought them to Menchie's for frozen yogurt. Not seen on the outing was youngest son Reign.

The father-of-three dressed for comfort in a plain white T-Shirt, grey jeans, and all-white Adidas Ultra Boost trainers. 

Daddy duty: The 33-year-old did not have a pleased look on his face as he treated his seven-year-old son and four-year-old daughter to lunch at King's Fish House.

Daddy duty: The 33-year-old did not have a pleased look on his face as he treated his seven-year-old son and four-year-old daughter to lunch at King's Fish House.

Bonding: He was definitely a cool dad as he later brought them to Menchie's for frozen yogurt. Not seen on the outing was youngest son Reign

Bonding: He was definitely a cool dad as he later brought them to Menchie's for frozen yogurt. Not seen on the outing was youngest son Reign

His brown locks were combed over as he had a considerable amount of scruff on his face. 

Mason looked on-trend in a bleached Harley Davidson Motorcycles shirt with white shorts and white sneakers.

Penelope wore a white top with ripped jean shorts and fur-lined sandals.

Hot stuff: This comes after ex Kourtney Kardashian shared several photos from her girls' trip to Mexico

Hot stuff: This comes after ex Kourtney Kardashian shared several photos from her girls' trip to Mexico

Copy Kourtney in her Private Party swimsuit

The weather is still very temperamental right now, so it's rather envy-inducing seeing anyone enjoying a sun-soaked sojourn abroad. Especially this amazing looking girls' holiday in Mexico!

That said, it has been excellent for one thing and that's spotting stylish swimwear. From Kim Kardashian's penchant for logo two-pieces, to Kourtney's array of stylish bikinis, we've had no shortage of holiday inspiration!

So far Kourt has donned a classic black number by White Fox, a glam sequin design, a blue velvet duo by Triangl, and she's also dabbled in the crochet bikini trend. Now comes this slogan swimsuit!

The slogan trend continues to be huge this season and swimwear hasn't escaped the action. Kourtney's one-piece is by Private Party who were one of the first labels on the slogan swimwear scene. Everyone from Miley Cyrus, to Olivia Munn has worn costumes by the brand before.

Click right to get Kourtney's exact 'Mamacita' design, or see what the high-street has to offer with the picks below!

* PRICES MAY NOT BE AS ADVERTISED
Just the girls: The 38-year-old stunner had a blast while going wild with her female friends

Just the girls: The 38-year-old stunner had a blast while going wild with her female friends

Magic hour: The reality beauty shared a shot of her enjoying a beautiful sunset, which she captioned 'cielo magico,' meaning 'magic sky'

Magic hour: The reality beauty shared a shot of her enjoying a beautiful sunset, which she captioned 'cielo magico,' meaning 'magic sky'

The bonding outing comes just days after his ex Kourtney's rowdy trip to Tulum, Mexico with sister Kim and their gal pals.

The 38-year-old Keeping Up With The Kardashians star was there to celebrate her latest birthday and did it with a bang as she showed off her fantastic figure in teeny, tiny swimwear.

St the time Kim, 36, was keeping fans up-to-date on their ridiculous antics on Twitter, revealing Kourtney 'threw up in her bed' and even 'slept in it.'

Wow: Kourtney shared several bikini snaps while on her trip. The most dating was shared on Wednesday when she wore a sexy black two piece

Wow: Kourtney shared several bikini snaps while on her trip. The most dating was shared on Wednesday when she wore a sexy black two piece

Tender is the night: Kourtney captioned this evening shot of her and pal Nicole Reda 'en la noche'

Tender is the night: Kourtney captioned this evening shot of her and pal Nicole Reda 'en la noche'

Girl time: The ladies held hands as they stood side-by-side in this image shared by a friend

Girl time: The ladies held hands as they stood side-by-side in this image shared by a friend

The reality star tweeted: 'So I'm gonna give u guys a play by play of the trip so far.

'@kourtneykardash threw up in her bed 4 times and slept in it.'

She later added: 'Oh and @kourtneykardash won't stop doing naked cart wheels.'

Kourtney has since returned home and was seen out filming their reality show with mother Kris Jenner and her two eldest children in Calabasas earlier in the day on Monday. 

Making a run for it! The mom shared a snap video of herself dashing towards the water while clad in an especially cheeky black bikini

Making a run for it! The mom shared a snap video of herself dashing towards the water while clad in an especially cheeky black bikini

Making waves: The mother-of-three looked incredible in her tiny black two piece
Making waves: The mother-of-three looked incredible in her tiny black two piece

Making waves: The mother-of-three looked incredible in her tiny black two piece 

Red hot! The star sizzled in an itty bitty bikini 

Red hot! The star sizzled in an itty bitty bikini 

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