Jenna Bush Hager celebrates exciting news with twin Barbara following the success of their new book

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Jenna Bush Hager and Barbara Bush, following the news that their new book, The Superpower Sisterhood, has become a New York Times Bestseller.MORE: Jenna Bush Hager's wedding had a personal connection to the White HouseWhat's more, the twins' book only hit the shelves two weeks ago, making it even more of an achievement.Jenna proudly announced the news on Instagram on Thursday, alongside the message: "Thanks to all the incredible sisters who supported #superpowersisterhood this past week!!"VIDEO: Today's Jenna Bush Hager praises mom Laura BushThe Superpower Sisterhood follows the story of only child Emma, who has been lonely all her life growing up in a neighborhood with no other children, until the day two sets of sisters move to her street and they realise their individual talents, when put together, create superpowers.MORE: Jenna Bush Hager and Barbara Bush open up about sisterhood and life in the White HouseMORE: Hoda Kotb supports Jenna Bush Hager during proud momentJenna and Barbara opened up about their book while chatting to HELLO!, and revealed that their mom, former First Lady Laura Bush, was the inspiration behind the story as she too was an only child growing up.A post shared by Jenna Bush Hager (@jennabhager)Today's Jenna Bush Hager and Barbara Bush are New York Times Bestsellers!"Our main character, which may be unusual in a book about sisterhood, is an only child, but then one day two sets of sisters move onto her block and she becomes an honorary sister and they work together to make their street better," Barbara explained.MORE: Hoda Kotb's stand-in host revealed as star takes time off TodayMORE: Hoda Kotb and Jenna Bush Hager's stand-in hosts get Today viewers talkingWhat's more, the sisters wrote the.