Rapper Machine Gun Kelly's tour took an unexpected stop early this morning -- to jail ... after he was busted by police in Florida for misdemeanor disorderly conduct.
According to the website for the Pinellas County Sheriff's Office, MGK (real name Richard Baker) was busted at 4:12 AM and released a few hours later after posting $100 bond.
Kelly tweeted about the arrest, saying, "Just spent my entire night in a f**king Florida jail...s**t escaladed way to quick last night, it always does with us though."
MGK is currently touring and played the State Theatre in St. Petersburg last night. His next tour date is in Los Angeles on February 8.