Last week was bittersweet for Beyonce Knowles.

The 31-year-old and her husband, Shawn "Jay-Z" Carter, experienced their first legal setback since they gave birth to their daughter Blue Ivy.

On the day that it was announced that Beyonce will headline the half-time show during the 2013 NFL Superbowl, the singer lost a legal battle against a Boston wedding planning company over exclusive rights to the name Blue Ivy.

Boston's local Fox news affiliate, Fox 25, reported on Saturday, Oct. 20, that Blue Ivy Events can keep the name of their company; the "Crazy In Love" singer and her "Watch The Throne" husband had filed an application to have exclusive use of the name Blue Ivy. According to several reports, the multi-Grammy winner intended to launch a clothing line with the name.

The couple reportedly filed the application with the U.S. Patent and Trademark Office in late January. Not long after, the owner of Blue Ivy Events, Veronica Alexandra, sued for the right to keep her company's name. Blue Ivy Events has been in business since 2009.

On Tuesday, Oct. 16, Alexandra successfully won the case to keep her company's name.

The Blue Ivy Events owner has no hard feelings. She is such a fan of the chart-topping couple that she features a picture of the couple on her website with a message, "Congrats to our soul mate couple with baby Blue Ivy."

"I can't be frustrated with something I think is going to bring me to produce and define my brand even more, which is financially exciting in itself and intellectually exciting as well," Alexandra told Boston Herald. "It's like they caused me to create more opportunity for myself." 

"I definitely needed to protect what it is I've been living on," Alexandra added. "Now it's time to create the partnerships and business avenues I'm planning on doing, period." 

It was reported by The Associated Press on Oct. 16 that Beyonce will headline the half-time show during the Super Bowl XLVII in February 2013 in New Orleans. The NFL's biggest game will be held in New Orleans' Mercedes-Benz Superdome.

The pop superstar confirmed she will headline the half-time show when she posted a photo of herself with the words "Feb 3, 2013" inked on her cheeks. And in an entry, posted on her official website, www.beyonce.com, the Grammy-winning singer used the caption "countdown to touchdown" to acknowledge the report.

The annual NFL championship attracts more than 100 million TV viewers and high profile pop acts for its half-time show. Previous performers have included Madonna, The Rolling Stones, Bruce Springsteen, U2 and Paul McCartney.