The 'It Wasn't Me' hitmaker has been hoping to land an invitation to the couple's big day in May so he can take along the class B drug as he insists ''weed'' is essential for a good party.
According to the Daily Star newspaper, Shaggy - who will perform for Harry's grandmother Queen Elizabeth at the Commonwealth Concert next month - was asked if he'd take ''weed'' to the bash, and responded: ''Yeah. I was hoping [for an invite]! They might need a Jamaican, somebody has to carry the weed! Somebody has to bring that to the party.''
The reggae star has previously suggested that his style of music, as well as cannabis, could be the way forward when it comes to bringing an end to terrorism.
He recently told the New York Times newspaper: ''If you're able to cut a man's head off, you're sick. But right, music evokes emotion.
''So if they're listening to Shaggy music or reggae music, they're not going to want to cut somebody's head off... There're two thing you want to do when you listen to reggae: You get somebody pregnant, or you're f***ing high.
''High people don't want to kill nothing; they want to love. They need to bag some Jamaican weed and distribute it amongst ISIS. I guarantee there won't be any more wars out there ... Throw some Bob Marley up in there and there'll be peace.''
Shaggy will be amongst those performing at the queen's 92nd birthday celebrations on April 21.
The line-up will also include the likes of Sting, Shawn Mendes, Anne-Marie, Craig David, Kylie Minogue and Sir Tom Jones.
Meanwhile, the day before the concert will see Shaggy and Sting release their collaborative album '44/876', with the latter suggesting the LP would ''surprise'' people.
He said: ''The most important thing to me in any kind of music is surprise ... And everybody is surprised by this collaboration - by what they're hearing. We're surprising.''
Sting previously revealed that he and the Jamaican-American rapper got together last year ''to jam and create music that reflects their mutual love of Jamaica, its music, people and culture'' and, as a result of their time in the studio, they've come up with some ''Caribbean-flavoured songs.''
Speaking about how they have ''a lot in common'', he added: ''We have a lot in common. We're both married to very strong women. We both come from small islands that used to belong to the queen. And we like each other. We like each other's voices and music and vibe. We're like kindred spirits.''