Millie Mackintosh and beau Professor Green touch down for a romantic holiday

PUBLISHED: 07:34 EST, 25 May 2012 | UPDATED: 07:37 EST, 25 May 2012

They've kept their relationship relatively low-key, but it's no secret that things are getting ever more serious between Made In Chelsea star Millie Mackintosh and her rapper beau Professor Green.

The clearly besotted couple, who have largely avoided being seen together in public, touched down in Ibiza together looking delighted at the prospect of some quality time.

Millie looked chic but relatively casual by her usual Chelsea standards in skinny jeans, a white blazer and white vest.

Romantic break: Millie Mackintosh and her boyfriend Professor Green touched down in Ibiza on Tuesday

She accentuated her slender legs with chunky wedge heels, and wore sunglasses in her slightly messy loose hair.

Ever the gentleman, Prof Green- real name Stephen Manderson- deal with the larger cases while Mille carried her smaller carry-on bags.

Stephen was casual in jeans, a black t-shirt and black trainers, a far cry from Millie's previous boyfriend, MIC dandy Hugo Taylor.

In it for the long haul? Six months in the pair's relationship shows no sign of slowing down

Ever the gentleman: Professor Green took care of the larger cases while Millie carried her handbags

Millie has tweeted that she is in Ibiza for a friend's wedding, writing: 'On my way to a wedding, haven't been to one since I was about 8! what a perfect day for it #summer'

She posted a pic of her outfit, adding: 'Now I'm excited to see what the bride is wearing..'

Six months into their relationship, the she and Stephen look as though they could be in it for the long haul.

Laid-back look: Millie wore little make-up, clearly comfortable around her beau

When it was first rumoured that they were seeing each other last November, it was claimed that they had met at a yoga class.

Millie told YOU magazine: 'Actually Stephen saw my picture on the cover of FHM [she's also just been voted 15th in its 100 Sexiest Women poll] and his publicist said, "I can get you her number."'

'She knew the editor of FHM who sent me an email and I said, "Is he a nice guy?" and he replied, "Yes, he's really funny, he's great," so I thought, "Why not?" Half an hour later Stephen called.'

Can't keep her mind off him: In a recent interview with YOU magazine Millie could barely speak about anything but Stephen

'This feels like my first proper relationship because we actually want to treat each other properly.'

'I feel so comfortable with him – when we are hanging out I hardly ever wear make-up and I am even happy wearing my glasses.'

'Equally I love to dress up for him. We like to surprise each other. Not long after we met he was working in New York and I sent red roses and a teddy to his hotel. Now whenever he is away I have the teddy – we call him Edward – in bed with me sprayed with Stephen's aftershave.'