Paris Hilton is annoyed by her younger sister for accepting the invitation to Nicole Richie’s wedding.

Nicky Hilton has demurely agreed to attend the ceremony uniting Nicole with DJ Adam Goldstein, knowing the fact that former mates Paris and Nicole have fallen out so badly that they are no longer speaking.

Nicky was quoted as saying: “My friend Nicole Richie is engaged so I’m in the bridal party for that one.”I’ve got some organising to do. I’ve never been to a bachelorette party so I don’t know where to start.”

Whereas, things couldn’t be more different with Paris, who recently released a statement saying, “It is no big secret that Nicole and I are no longer friends.”

So she is now reportedly furious with younger sibling Nicky, 23, for agreeing to go to the bash. A source said: “Nicky still likes Nicole and doesn’t want to share Paris’ feuds. She says she feels like Cinderella being banned from the ball by her sister.”

Paris and Nicole - who have been best friends since school - reportedly fell out when Nicole played the hotel heiress’s infamous sex video at a party. Their show ‘The Simple Life’ was recently cancelled when they refused to make amends.