Due to its growing size, Miranda Lambert's annual Cause for the Paws concert benefiting the Humane Society of East Texas is being postponed. The news came from Miranda's mother, Bev Lambert, in a recent fan newsletter.

"After much consideration and coordination effort, we have come to the realization that we will no longer be able to host Miranda's annual Cause for the Paws concert in East Texas," Bev wrote (quote via MirandaLambert.com). "Due to the enormous turnout with Miranda's growing popularity, we regrettably do not have a venue in East Texas that is suitable for the attendance numbers. We are currently in talks regarding the relocation of the event, which will most likely take place in the latter part of 2012."

In 2011, the concert -- which included performances by Josh Kelley and Stoney LaRue -- raised more than $300,000, thanks to the record amount of attendees.

"Going from 1,000 to over 7,000 in attendance was quite the feat, and we are more than thrilled with the outcome!" Miranda wrote on her website following the show. "It's a moving experience to see all of the support for a cause that is so close to my heart. I am thankful to my fans and everyone who came to be part of this day and help these animals."

Since her first Cause for the Paws event in 2008, the songstress has helped raise more than $600,000 for the Humane Society of East Texas. In her statement, Miranda's mom notes that the family will continue to support the organization, and she thanks everyone involved for assistance in reaching their half-million dollar goal.

The multi-platinum-selling singer is currently on her On Fire tour, with Chris Young and Jerrod Niemann serving as opening acts. Their next stop is Feb. 16 in Massachusetts. Get details here.

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