No wonder he's so happy! Roberto Cavalli, 73, waves exuberantly as he bares (almost) all in yet another sunbathing session with much younger model girlfriend

They've been treating Miami's beaches to a hearty glimpse of their age-gap romance all week.

And it appears the lazy days have been great for Roberto Cavalli's mood as the delighted designer threw his hands in the air in an enthusiastic wave during yet another sunbathing session with his much younger girlfriend, Lina Nilson.

The 73-year-old Italian clothing connoisseur once again showed off all but his privates in a miniscule pair of shorts by the side of the bikini-clad model as he took a break from Art Basel festivities.

Sprung! Roberto Cavalli, 73, relaxed in his tiny tight shorts on a Miami beach with his much younger girlfriend Lina Nilson on Saturday and was seen flapping his arms about in an enthusiastic wave

Best day ever! The Italian fashion designer looked mighty pleased to be walking beside his model girlfriend

From where Roberto stood behind a conspicuously placed deck chair, you wouldn't be blamed for thinking he was naked as he raised the roof with both arms elevated high in the air.

Lina, who is believed to be in her 20's, looked mildly amused at her older boyfriend's antics, as she showed off her long slender legs enjoyed a little giggle with him.

Prior to removing his clothing, the style giant wore a suave button-down denim shirt and white sand shoes without laces as the happy age-gap couple strolled down the beach together.

Roberto's number one: Lina shimmied about in a leopard print bikini showing off her perfect physique

Look at these! Roberto appeared to be giving himself a nipple-cripple although it's likely he was simply re-clothing himself as he chatted with his model girlfriend

Having a little boogie? The well tanned designer listened to some tunes while he relaxed

Lina slipped into tiny, sexy white denim shorts with animal print pockets hanging low below the petite garment, which she teamed with a loose-fitting white shirt.

Showing that they're on the same page aesthetically, the model wore the same leopard print bikini that she wore earlier in the week, whilst her beau carried a matching leopard print beach bag.

The young brunette stripped down to her bikini, revealing her youthful, picturesque model physique.

Fixing those tresses: The suave Italian gentleman smoothed his locks while his girlfriend fussed around

Just chilling: Lina covered herself up with a sheer white shirt while Roberto figured out his next move

Maximum tanning potential: Roberto made sure he had as much skin on show as possible in order to tan

Things apparently could not have been more blissful for jolly old Roberto, who was positively beaming as he waved at the shutterbugs, acknowledging his notoriety as he graced the white sands with his stunning companion.

The gallant gentleman threw a loving arm around his young girlfriend as they wandered, making her laugh here and there with his charm and wit.

It had clearly been a mighty fine day for the couple, who spent time lounging in comfortable deck chairs in the Miami sunshine, listening to music and drinking cool beverages.

Hello there: At one point he was photobombed by a female's rear end

Ahoy! Roberto threw out waves left, right and centre as he left the beach with Lina

Excuse me: Lina reached behind her gentlemanly boyfriend to grab something

While he was sleeping: Lina had a glance around while her man was snoozing in the sun

Surely eager to ensure maximum tanning potential, Roberto's navy blue shorts were as petite as possible, only covering the bare essentials so that the rest of his body could be hit by the Florida rays.

The pair even had matching red headphones and were both spotted enjoying a tune or two to add further atmosphere to their chilled out day.

Roberto seemed more than happy with his, at one point even appearing to 'get down' with the beats while a nearby female curiously photo-bombed him with her outstretched rear end.

Getting situated: Lina sat up for a moment with her headphones looking a little bored

Matchy matchy: Both Roberto and Lina looked to have a thing for animal print

Yes, it's me! Roberto waved happily as he walked by Lina as a mystery blonde tried to steal their thunder

What a gentleman: Roberto slung a caring arm around his much younger girlfriend

Roberto seemed to have a firm hold of his personal tasks on Saturday, dressing and undressing himself seemingly without any help from Lina, whereas she has been seen earlier in the week performing carer-type tasks for the gentleman.

The couple is currently in Miami for Art Basel, joining a gaggle of celebrities who flock to the event each year to soak up a little culture.

On Wednesday, Roberto was spotted hanging out around the likes of Kim Kardashian and Kanye West.

Hilarious story! Lina giggled as her man seemed to be telling her something with a little comic value

Is it the look of love? The pair stared lovingly into each others eyes as they talked

A little exercise: The 73-year-old got a little workout in as he trudged through the sand

Excuse me while I dress: The fellow was caught in the act of re-applying his denim shirt

She looks after herself! Not a single criticism could possibly be uttered about the state of Lina's figure

What are you looking at? The esteemed clothing aficionado threw the shutterbugs a glance

Beach meeting: Roberto also did a little work on the beach, meeting with Lenny Kravitz behind the Delano Hotel

Come over here: Roberto ushers Lenny over to his cabana

Check this out: Lenny shows Roberto something on his phone while sitting on a lounge chair

Thank you my friend: The two go in for a hug after their meeting

All done: The musician leaves the beach showing off his tattoos