The Kingswells girl's winning entry was chosen by a panel of judges who were very highly impressed by the overall quality of entries submitted by youngsters from across the north east.
Becky's design will now be worn by up to 1500 participants in the MPH primary schools 1.5K and the Kongsberg Maritime secondary schools 2.5K at the annual road running festival at Balmoral Castle over the weekend of Saturday 27th and Sunday 28th April.
RunBalmoral chairman James Knowles said:"This is the first time we have organised a competition of this nature and we were delighted with the number of submissions we received.
"It was a tough job choosing a winner, but Becky's entry just stood out ahead of the others and we are delighted that her work will now be on the race t-shirts."
Becky, who will be running for her club, Aberdeen AAC, at Balmoral, was excited when she heard she had won.
She said:"I am very pleased as I honestly didn't think I had a chance of winning. I like drawing and art so it's great that I've actually won. It's exciting.
Becky receives a free entry to the race and a Run-4-It voucher. She said: "I've never run at Balmoral before but I've always wanted to. So now I'll be there, wearing my t-shirt with pride."
Pic 1 show Becky wearing her t-shirt and receiving her prize from Elaine Taylor, Run-4-It Aberdeen shop manager and Allison Craig, Kongsberg maritime.