On Travis' side, his son Landon, 18, and daughter Alabama, 16, will be there, as will his bandmates.
Both the bride and group will also have "a few" close pals at the wedding, which will take place at Castello Brown.
The stunning venue sits on top of a hill and boasts stunning harbour views.
The couple have rented out the entire castle, which was built during Roman times as a military defence, and will be celebrating their nuptials over the next four days.
And that's not all as they are also planning another huge reception for their friends back in Los Angeles "in the near future".
The newlyweds recently shared a series of black-and-white snaps from their legal wedding on Instagram, in which the Poosh founder wowed in a Dolce and Gabbana gown with a price tag of £1474 ($2880), complete with a bodice with a heart on the bust, while rock star Barker wore an all-black blazer-style jacket and trousers.
In one snap, the pair are joined by the reality star's grandmother Mary Jo 'MJ' Campbell and Barker's dad Randy, who were the witnesses.
Although the loved-up pair were thought to have tied the knot during a ceremony at the One Love Wedding Chapel in Las Vegas in March, the wedding wasn't legally binding because they did not obtain a marriage licence.
This is the third marriage for the 46-year-old Blink-182 drummer, who was briefly married to first wife Melissa Kennedy between 2001 and 2002, before he went on to tie the knot with the mother of his children, Shanna Moakler.
Kardashian has never wed until now.
