Justin Bieber lost his monkey to quarantine in Germany last week.
The Canadian pop-start landed without documents required to bring a capuchin monkey into the country, breaking the country's health code.
"The animal required a certificate of health and other authorizations," a customs spokesman told The Sun.
Bieber was detained for "some time," according to the UK newspaper, and the singer could now face a fine of more than $15,000.
"You cannot just land with a wild animal and bring it into the country if the flight has not originated from another EU country and you don't have the proper paperwork," the customs spokesman said.
Apparently the monkey was a gift from record producer Mally Mall, who recently tweeted:
OG MALLY FIRST PIC WITH HIS POPS @justinbieber instagram.com/p/XYWRzlv_Hq/