Hugh Hefner and fiancé Crystal Harris today gave fans a sneak peek of their wedding invitations on Twitter.

The Playboy mogul posted a photograph of the card that is being issued to friends and family ahead of the June ceremony.

It reads: 'Crystal Harris and Hugh M Hefner request the pleasure of your company at the celebration of their marriage.'

Guests are being asked to wear 'semi formal attire' to the nuptials on June 18 and the pair will exchange vows at the Playboy Mansion with a reception and dinner to follow.

The envelope is even trimmed with a stamp featuring the happy couple.

The 24-year-old model, who will become the 85-year-old's third wife, is planning on wearing a Ramona Keveca design.

'This will be the most romantic wedding ever,' Crystal promised last month.

Playboy spokeswoman Kellie Olisky added: 'No expense is being spared for the wedding.

'It isn't even a compromise, because Hef wants Crystal to have the wedding of her dreams.'

Around 300 people will be invited and the estate will be decorated in pale, summery hues and bright flowers.

DJ Cassidy, who is performing at Cocahella with Kanye West, will hit the decks while musician Ray Anthony will also provide entertainment.

As well as making the wedding dress, designer Ramona Keveca will also provide the bridesmaids with dresses.

Crystal is having her two sister and Anna Berglund, Miss January 2011, as attendants while Hugh's brother Keith and two of his sons, Marston and Cooper, make up the groom's party.

Hefner, who is worth around $43million, said to have decided against putting a pre-nuptial agreement in place.

Hefner, who founded Playboy in 1953 with Marilyn Monroe as his first cover girl, has been married twice before.

In 1949, he wed Mildred Williams with who he had two children, Christie, now 58, and David, now 55.

Before their wedding, Mildred confessed to Hefner that she'd had an affair while he was away serving in the Army, so she allowed him to sleep with other women because of her guilt over her infidelity, but they divorced in 1959.

Then in 1989 he married Playboy Playmate Kimberley Conrad, who gave him two sons, Marston Glenn, 20, and Cooper Bradford, 19, but after 11 years of marriage, Hefner filed for divorce from Conrad stating irreconcilable differences, which was finalised in March last year.

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