The Treasury's official cat Gladstone has gone missing in Westminster.
Philip Hammond's three-year-old moggy is believed to be on the loose and officials are desperately trying to track him down, reports the Sun.
The cute cat has become a favourite among MPs who use him - and Number 10's Larry and Palmerston from the Foreign Office - to connect with voters.
A source said: 'Some people are really worried about him, they love him around the department. Hopefully we'll find him soon.'
Workers were told to keep an eye out for the black shorthair yesterday.
Gladstone arrived in the Treasury office two years ago and since then he has been plastered all over Instagram and Twitter.
Pictures on social media show him wearing his iconic red spotty bow tie and a Union flag jumper.
More than 15,000 people follow the Treasury cat Instagram account - making it one of the most popular Conservative pages.
Gladstone was adopted by the department from the Battersea Dogs & Cats Home in south London, and civil service staff pay for his food and accessories from their own pockets.
Officially he holds the title of Chief Mouser to the Treasury and he has caught at least 22 mice since he began his new 'job'.
He has been far more successful the Number 10's Larry, who is said to lack the killer instinct. Pest control were called to the PM's home 29 times in one year.
Read more: Panic at the Treasury as Philip Hammond's cat Gladstone goes MISSING prompting frantic search