Bottoms up! Jimmy Fallon flaunts his delightful derriere as Joe Jonas gives him underwear modelling lesson
Usually it is the old man who passes along his wisdom to the younger.
But Joe Jonas mentored Jimmy Fallon on the finer points of underwear modelling as they hammed it up on the Tonight Show on Monday.
The dynamic duo each pulled on a pair of boxers over their trousers so they could partake in an hilarious pose down in front of the ebullient audience.
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![A pants story: Joe Jones and Jimmy Kimmel flaunted their delightful derrieres as they partook in a mock underwear modelling session on The Tonight Show on Monday](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/00/3CEB67B900000578-0-image-m-4_1486514742459.jpg)
A pants story: Joe Jones and Jimmy Kimmel flaunted their delightful derrieres as they partook in a mock underwear modelling session on The Tonight Show on Monday
The nonsense began after Jimmy whipped out a photograph of the Jonas Brothers favourite reclining on a chair in just a pair of Guess pants.
Explaining the cringeworthy photograph, the 27-year-old DNCE frontman said: 'I'm trying to figure out why I did this one. Like, I'm just airing it out a little bit.'
Jimmy then magically produced a couple of pairs, and begged his guest to 'show me how it's done.'
The pair then stood virtually cheek to cheek as they playfully flaunted their pert posteriors, with the former SNL star's firm, yet pleasingly round, derriere undoubtedly stealing the show.
![Boxing clever: After congratulating him on his underwear campaign Jimmy whipped out some of his own](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11EC000000578-4202068-image-a-6_1486515810669.jpg)
Boxing clever: After congratulating him on his underwear campaign Jimmy whipped out some of his own
![Slipping into something more comfortable: The lads looked remarkably at ease in their pants](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11ECF00000578-4202068-image-m-17_1486516027961.jpg)
Slipping into something more comfortable: The lads looked remarkably at ease in their pants
![Cheeky boys: The former SNL star's firm, yet pleasingly round, derriere stole the show](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11EE600000578-4202068-image-m-8_1486515854734.jpg)
Cheeky boys: The former SNL star's firm, yet pleasingly round, derriere stole the show
And as they worked the set, they then attempted to copy the Kleptomanic favourite's slouched chair pose.
Making a feeble attempt at a contemporaneous joke, Joe said, 'It's the Falcon fan losing pose,' referencing the Atlanta NFL side's embarrassing collapse in Sunday's Super Bowl.
Jimmy also quipped: 'Your basically saying that anyone could be a Guess model.'
![Who would have thought it? Jimmy exclaimed that 'anyone could be a Guess model'](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11EF200000578-4202068-image-m-18_1486516852373.jpg)
Who would have thought it? Jimmy exclaimed that 'anyone could be a Guess model'
!['Falcon fan losing pose': Joe made a feeble contemporanious joke as he posed](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11F0600000578-4202068-image-m-19_1486516871756.jpg)
'Falcon fan losing pose': Joe made a feeble contemporanious joke as he posed
![Manly: Jimmy then attempted to recreate another of his guest's poses](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11F1A00000578-4202068-Manly_Jimmy_then_attempted_to_recreate_another_of_his_guest_s_po-a-1_1486518009250.jpg)
Manly: Jimmy then attempted to recreate another of his guest's poses
He then managed to persuade Joe to recreate a cheesy side on pose.
Referencing their ridiculous outfits, the chat show host said: 'I can't even do that. I don't even want to. It's like wearing diapers.'
Jimmy also congratulated his guest, who performed his imaginatively titled tune Cake By The Ocean, on become the first ever men's underwear ambassador for Guess .
A prestigious appointment indeed, as even the most cynical of observers are sure to agree.
!['It's like wearing diapers': But he gave up due to the extreme difficult of the position](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11F3200000578-4202068-image-m-13_1486515963653.jpg)
'It's like wearing diapers': But he gave up due to the extreme difficult of the position
![Showing him how it's done: Jimmy bellowed with joy as Joe pulled it off with aplomb](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CF11F3A00000578-4202068-Showing_him_how_it_s_done_Jimmy_bellowed_with_joy_as_Joe_pulled_-a-2_1486518009255.jpg)
Showing him how it's done: Jimmy bellowed with joy as Joe pulled it off with aplomb
![Keeping it brief: The nonsense began when the host whipped out his guest's semi-nude snaps](http://web.archive.org./web/20190425043016/https://i.dailymail.co.uk/i/pix/2017/02/08/01/3CEB66F500000578-4202068-Keeping_it_brief_The_nonsense_began_when_the_host_whipped_out_hi-a-3_1486518009256.jpg)
Keeping it brief: The nonsense began when the host whipped out his guest's semi-nude snaps
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