Jessica Biel and Justin Timberlake share an in-joke during rare PDA at Met Gala

PUBLISHED: 05:07 EST, 9 May 2012 | UPDATED: 05:31 EST, 9 May 2012

Anyone sharing a table with Justin Timberlake and Jessica Biel at the Met Gala on Monday evening would have felt like a prized gooseberry.

The couple looked utterly besotted with one another as they shared an in-joke, tenderly leaning their heads towards the other's to touch noses.

The Illusionist actress and SexyBack singer beamed with Cheshire cat grins as they closed their eyes while lost in laughter, clearly oblivious to anyone else in the room at that moment in time.

Loved up: Jessica Biel and Justin Timberlake engage in rare PDA at the Met Gala in New York on Monday

Justin, 31, looked rather dapper in his Tom Ford tuxedo and bow tie, mixing together his Hollywood flair with an urban edge by keeping his stubble.

Stunning fiance Jessica, 30, looked incredibly graceful in her unusual Prada gown with jade stones - and of course, a rather large rock on her engagement finger which cost an estimated $130,000.

While the dress fit like a glove, it seems the 7th Heaven beauty had a little difficulty wriggling into it though, with Biel tweeting: 'I can't zip up my dress. Welcome to my world! #MetBall'.

Sharing an in joke! The couple are said to have got engaged last December

The duo are not exactly known for their re! d carpet PDAs or puckering up in public, but a champagne flute and various wine glasses littering their table perhaps hint towards why they let their guard down.

It was also their first official outing together since getting engaged last December, when Justin is believed to have popped the question at the luxurious Amangani Resort in Jackson Hole, Wyoming.

Showbiz royalty: Jessica and Justin arrives arm-in-arm at NYC's Metropolitan Museum of Art on Monday night

The couple are believed to have already started scouting for wedding rings, after they were spotted trying on gems at jeweler shop Eli Halili in New York last Saturday.

A source told People: 'They were extremely personable, comfortable and relaxed. They weren't holding hands or anything, but they just seemed comfortable with each other.'

Justin and Jessica, who have been dating since January 2007, are reportedly looking at venues in Italy for their August wedding.