After achieving her seventh No. 1 hit with her latest single, 'Automatic,' Miranda Lambert decided she wanted to do something different than the usual Nashville party, so instead she threw a sock hop! Guests, including Colton Swon of the Swon Brothers, as well as her own parents, also wore poodle skirts and varsity jackets for the celebration.

"Thanks for being good sports and dressing up for this sock hop," she told the crowd (quote via People magazine). "I told [co-writers Nicolle Galyon and Natalie Hemby] that if this song went to number one we'd have a sock hop to celebrate, so we did!"

Aside from the reason for the party, Lambert was also celebrating something else -- the elimination of her signature long blond hair. The 30-year-old showed up with a brand-new bob, thanks in part to famed Nashville stylist Lee Wright.

"After all her recent photo shoots and covers in long hair, she decided she was ready for a change," Wright explains. "But when she sat down in my chair she looked in the mirror and got nervous, so we did kind of a shoulder-draping cut first."

Turns out, it was her husband, Blake Shelton, who gave her the courage to cut her hair even shorter.

"She was with Blake and sat down with his hairstylist and cut off about six more inches," Wright adds. "She sent me a photo, 'I did it!' It looks very cute like this, but it really looks fierce when she rocks it out for the stage."

Still, in spite of her brand-new 'do and stunning pale pink vintage prom gown, the songstress stayed focused on the reason for the gathering, and her success in country music.

"I'm so overwhelmed with everything going on in my life, but everybody in this room contributed to every dream I have coming true," Lambert told the attendees (quote via Nashville's Tennessean). "Thank you to [my cowriters'] parents and mine for telling us you can be anything you want to be. We're here, we're in our Easter dresses and we're celebrating our No. 1 song."

'Automatic' is the lead single from Lambert's chart-topping 'Platinum' album. Download the record here.