Blake Shelton may have celebrated his birthday on Monday (6/18), but the party actually got underway a few days earlier. Gwen Stefani marked her beau's b-day with a weekend-long party, which also combined a Father's Day celebration with her dad, Dennis. Gwen shared several videos from their celebration on Instagram Stories, including the family singing "Happy Birthday" to Blake and Shelton returning the favor by serenading them with Alabama's "Dixieland Delight." And birthday fun continued on Monday, with Gwen surprising Blake with a brand new flag pole that had just been installed on the property. Shelton was also given a large Smithworks Vodka birthday cake, which he wasted no time taking a big bite out of. Watch the video here: https://www.instagram.com/p/BkLkBTVn0al/?hl=en&taken-by=blakesheltonA picture of Gwen and Blake posing in front of his new flag pole can be seen here: https://www.instagram.com/p/BkLG9_qFMxv/?hl=en&taken-by=gwenstefani