Nick Jonas looks laid-back in black leather jacket... while his beautiful girlfriend Olivia Culpo takes centre stage in short peplum dress at Las Vegas event

Nick Jonas let his beautiful girlfriend Olivia Culpo take centre stage on Sunday night.

The American crooner, 22, made a handsome appearance at celebrity hotspot Hyde Bellagio in Nevada to celebrate its three years on the Las Vegas Strip.

Dressed in a black leather jacket and distressed jeans, the singer appeared to be in great spirits as he happily posed on the red carpet with the former Miss Universe.

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Date night: Nick Jonas let his beautiful girlfriend Olivia Culpo take centre stage at a Las Vegas event on Sunday night

Date night: Nick Jonas let his beautiful girlfriend Olivia Culpo take centre stage at a Las Vegas event on Sunday night

Olivia, also 22, oozed heaps of glamour in a striking black peplum dress, which boasted a short hemline and a large statement belt that clinched her waist.

She elongated her sun-kissed limbs with strappy heels, while toting her belongings in a bold emerald green clutch.

With her glossy brunette tresses pulled back, the beauty queen complemented her stunning facial features with blush pink lips, rosy cheeks and smoky eyewear.

Doing their thing: The couple were at celebrity hotspot Hyde Bellagio in Nevada to celebrate its three years on the Las Vegas Strip

Doing their thing: The couple were at celebrity hotspot Hyde Bellagio in Nevada to celebrate its three years on the Las Vegas Strip

Keeping his cool: Dressed in a black leather jacket and distressed jeans, the singer appeared to be in great spirits as he happily posed on the red carpet with the former Miss Universe

Keeping his cool: Dressed in a black leather jacket and distressed jeans, the singer appeared to be in great spirits as he happily posed on the red carpet with the former Miss Universe

During the festivities, Olivia took to her social media sites to share a snap with her beloved and captioned it: ‘Romeo, Romeo, where art thou Romeo... #VEGASBABY @nickjonas.’

The genetically blessed couple, who have been dating for 19 months, appear to be more loved-up than ever with Nick revealing to People that his girl makes his life easier.

‘I think anytime you have a teammate it makes things a little easier,’ he explained. ‘It has been a wild ride and a crazy year and a half. It's been really special.’

Bold: Olivia, also 22, oozed heaps of glamour in a striking black peplum dress, which boasted a short hemline and a large statement belt that clinched her waist

Bold: Olivia, also 22, oozed heaps of glamour in a striking black peplum dress, which boasted a short hemline and a large statement belt that clinched her waist

Standing tall: She elongated her sun-kissed limbs with strappy heels, while toting her belongings in a bold emerald green clutch
Standing tall: She elongated her sun-kissed limbs with strappy heels, while toting her belongings in a bold emerald green clutch

Standing tall: She elongated her sun-kissed limbs with strappy heels, while toting her belongings in a bold emerald green clutch

Earlier this year, Olivia gushed to Yahoo: 'He always smells really good, so whatever he's doing now works.'

The heartthrob, who was a member of the boy band The Jonas Brothers until they disbanded in 2013, was previously linked to Disney star Selena Gomez and Australian actress Delta Goodrem. 

Nick split with 30-year-old Delta in 2012 following a 10-month romance.

Updating fans: During the festivities, Olivia took to her social media sites to share a snap with her beloved and captioned it, ‘Romeo, Romeo, where art thou Romeo... #VEGASBABY @nickjonas.’

Updating fans: During the festivities, Olivia took to her social media sites to share a snap with her beloved and captioned it, ‘Romeo, Romeo, where art thou Romeo... #VEGASBABY @nickjonas.’

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