After pleading no contest to domestic violence against an ex-girlfriend, Allen -- who won the Fox reality dance competition in 2008 -- was convicted of one felony count of willfully injuring a girlfriend and assault with a deadly weapon for two separate incidents, Deadline Hollywood reported.
Allen was sentenced at Van Nuys Courthouse in California on Thursday to one year in jail.
Allen will also reportedly have to serve five years of probation upon his jail release and undergo one year of domestic-violence counseling. The judge presiding over the case, Judge Michael Kellogg, additionally ordered Allen to stay away from the victim for 10 years or else face further imprisonment.
The assault with a deadly weapon conviction stems from a June 19, 2016 incident in which the 28-year-old dancer allegedly attacked an ex-girlfriend and chased her into a coffee shop when she managed to escape his grasp.
Once inside the shop, Allen reportedly got into a fight with a man trying to protect the woman and threw a glass vase at another female who intervened, according to Deadline Hollywood.
Allen reportedly caused some damage in the shop until the Los Angeles County District Attorney Jackie Lacey's office says he was "subdued by other good Samaritans."
Allen previously assaulted the same ex-girlfriend on another occasion in April 2016, Deadline Hollywood reported.
Allen's other run-in with the law in which he was convicted of "willfully injuring a girlfriend" occurred on January 13, 2016. At the time, he was actually dating the victim when he allegedly attempted to strangle her.
When Allen was first charged in these matters in July 2016, he reportedly avoided a potential decade in prison.