Romeo Beckham cheekily grabs model girlfriend Mia Regan's bottom as they celebrate her 21st birthday after he got a tattoo tribute to mark the occasion

Romeo Beckham and girlfriend Mia Regan looked more loved-up than ever as they posed for Instagram pictures while celebrating her 21st birthday at Bacchanalia restaurant in Mayfair on Monday.

The couple cosied up for sweet snaps after the footballer, 21, unveiled a tattoo tribute to the model to mark her birthday weekend. 

Cheeky Romeo grabbed Mia's bottom in one image, while pulling an animated facial expression for the camera. 

Mia looked incredible in a high neck sleeveless black top from Susamusa, which she teamed with a coordinated skirt. 

Romeo, the middle son of David and Victoria Beckham, dressed cool in a crisp white T-shirt which he teamed with a pair of Supreme washed denim jeans. 

It comes after Romeo unveiled a tattoo tribute to long-term love Mia to mark her 21st birthday over the weekend. 

The beauty, who uses the moniker Mimi Moocher, was the subject of the Beckham boy's latest body art - featuring the word 'Mooch' on his bicep, which she proudly shared with her followers while they dined at Bacchanalia restaurant in Mayfair. 

The Beckham clan are known for their love of tattoos and Romeo has wasted no time catching up with his father David and brother Brooklyn's three figure body art. 

Romeo's tribute to his girlfriend appears to be learnt behaviour, as his older brother, 24, has a whopping 70 tattoos dedicated to his wife Nicola Peltz. 

The couple have been dating since 2019 and after a brief split last summer they reunited and are now stronger than ever. 

Last year, they confirmed their split and Romeo deleted all traces of London-based model Mia from his Instagram.

It is believed that the toll of a long-distance relationship ultimately contributed to the break-up with Romeo pursuing a football career in Miami, Florida.

Mia and Romeo celebrated their three-year anniversary shortly before they announced that they had parted ways last year.

At the time, she stayed friendly with his family and even collaborated with his mother Victoria Beckham on her self-titled fashion brand.

Sources confirmed to MailOnline that the couple split due to the pressure caused by their conflicting work schedules, with Romeo spending much of his time in the United States while he pursues a football career.

Clearly stronger than ever, the happy couple beamed in a slew of snaps Romeo shared with his 3.9million Instagram followers. 

In an accompanying caption, he penned: 'HAPPY 21st gorgeous girl I love you so much @mimimoocher'. 

Last month, the Beckham boys all had 'Brotherhood' etched on different parts of his body, in their first group tattoo. 

The eldest of the three, Brooklyn, opted to have his new tattoo on his leg above his dancing lady body art, while Romeo also had his on his leg above his eagle inking, while Cruz chose to have his on his hand. 

London-based fine line tattoo artist Pablo, also known as Certified Letter Boy, took to his Instagram page on Friday to share some snaps of the intricate designs.

In the pictures, the boys could be standing with their arms draped on each other's shoulders, while some photos displayed the new tattoos.

Cruz happily posed for a picture as Pablo went to work, with the teen jokingly wincing in pain as the needle met his hand.

As well as their matching ink, Romeo also got another tattoo during their trip to the parlour and took to Instagram to show off the result.

He shared a photograph of his back with a new quotation tattoo inked across his shoulder blade, as he follows in his father's footsteps with his script tattoos.

The quote, from the late fashion designer Virgil Abloh, read: 'Life is so short you can't waste even a day subscribing to what someone thinks you can do versus knowing what you can do.'