Rory McIlroy hilariously chugs a beer before belting out Journey's 'Don't Stop Believin' on stage with Shane Lowry after the pair's victory at the Zurich Classic in New Orleans

Rory McIlroy serenaded fans in New Orleans with a rendition of 'Don't Stop Believin' after winning the Zurich Classic with Shane Lowry on Sunday.

McIlroy and Lowry came through a playoff to win the competition at TPC Louisiana, having put it on their respective schedules in a bid to jump up the FedEx Cup standings.

And after defeating Chad Ramey and France's Martin Trainer on the first playoff hole, the pair celebrated their victory with a few beers and a live band playing Journey's famous 1981 hit.

In footage shared on the PGA Tour's social-media accounts, McIlroy can be seen chugging his beer on stage in front of hundreds of fans in New Orleans while Lowry laughs alongside him.

Rory McIlroy serenaded fans in New Orleans with a rendition of 'Don't Stop Believin' after winning the Zurich Classic with Shane Lowry

The Northern Irishman chugged a beer on stage with Lowry after their victory in New Orleans

Hundreds of fans watched McIlroy perform Journey's famous 1981 hit alongside a live band

When the band started playing Don't Stop Believin, the Northern Irishman took the microphone and belted out his best vocals for the supporters in attendance, who sang back to him.

Lowry resisted the urge to join his teammate in the singing department, nevertheless, before they exited the stage and went off to continue celebrating their triumph.

After starting the day seven shots off the lead, Ramey and Trainer fired a 9-under 63 in Sunday's round of foursomes to head to the clubhouse at 25-under 263. Other teams in the 25-under range soon wobbled and fell back -- including McIlroy and Lowry, for a brief time, before they rebounded from a bogey at No. 17 with a birdie at the par-5 18th hole to force the playoff.

They returned to the 18th tee to begin the playoff, and Ramey's second shot hooked left over the gallery. Trainer couldn't hit his third shot hard enough onto the green. Meanwhile, Lowry put his team in the bunker on the second shot but McIlroy made a nice recovery shot -- similar to his pitch shot on the 72nd hole to set up Lowry's 5-foot birdie that forced the playoff.

Lowry's birdie try in the playoff came to rest inches right of the cup, but Trainer pushed his short par putt that would have extended the playoff.

It marked McIlroy's 25th PGA Tour win and Lowry's third. Lowry had not won on U.S. soil since August 2015. 

McIlroy and Lowry came through a playoff to win the competition at TPC Louisiana

It marked McIlroy's 25th PGA Tour win and Lowry's third, with the latter not winning on US soil since 2015

'It's absolutely amazing,' McIlroy said on CBS Sports. 'We've had an awesome week here in New Orleans. The crowds have been absolutely amazing, to get the support we've had out there. We've had so much fun while doing it and it's just a bonus to win at the end.

'It couldn't be better than to do it with this man alongside me.'

Lowry added: 'It's great. It felt much-needed. Coming into the week we felt we could do with a big jump for the FedEx Cup, let's get 400 points each and that's what we've done.

'I feel a little bit bad taking them because Rory carried me, but I'm taking them.'