Chief whip Mark Spencer fell victim to an alleged hack as a picture of a cat and odd messages were sent from his Twitter account.
Mr Spencer has apologised for the unusual tweets, which he blamed on someone going on to his account unauthorised.
He tweeted: "Apologise looks like I’ve been hacked."
In the unusual posts, an image of a cat captioned with the words "NO NO NO NO NO NO" was sent from his account.
The picture was posted along with an unintelligible message which included a police emoji and an Italian flag.
The tweet has since been deleted.
It was sent as other Twitter users, including the Prime Minister, celebrated International Cat Day.
In a tweet, Boris Johnson wished Downing Street's "chief mouser" Larry the cat a very happy International Cat Day.
The Labour Party also paid tribute to their feline friends with a tweet showing leader Jeremy Corbyn and his cat El Gato enjoying reading John Steinbeck's The Grapes Of Wrath.
Additional reporting by PA.
