The former Reba star and her Sopranos alum pal will be pronouncing the 'Nsync singer and longtime boyfriend Michael Turchin husband and husband during a ceremony on Saturday (20Dec14).
Sigler took to Instagram.com on Monday (15Dec14) to show off her newly acquired ordination certificate from the Universal Life Church.
She added the caption, "Hey @michaelturchinart @lancebass... I'm ready! @jogarciaswisher lets do thisssss"
Bass previously revealed on his Sirius Xm radio show that Sigler and Swisher are the perfect pair to take on officiating duties.
He said, "We've asked our two best girlfriends to officiate this wedding because I cannot think of two better people to give us away. These two know us the best. Jamie has been part of my life for so many years, she knows where all the bodies are buried."
Sigler added, "I have thought a lot about it and I've had a few weddings since you asked me, so I've been taking notes. When you guys asked us I thought you were going to ask us to be in the wedding... but then when you said it I lost all bodily functions."
Bass and Turchin's nuptials will be filmed for a Tv special called Lance Loves Michael: The Lance Bass Wedding, which will air in America on 5 February (15).