Britney Spears ’ first husband Jason Alexander is rushing to her defense after her DUI arrest ... calling people out for jumping to conclusions when the full story isn’t even out yet. In an IG Reel, Jason -- who was famously married to the singer for just 55 hours before their annulment in 2004 -- pointed out her reported 0.06 blood-alcohol level is actually below the legal BAC limit in most states. He also said it’s possible any substances in her system could’ve been legally prescribed