United States will celebrate Grandparents' Day on Sunday, 13 September. While in today's age and time, it is quite difficult to see youngsters spending time with their grandparents, there are still quite a few people, who adore and love them. The day has been celebrated since 1978, when the then-President Jimmy Carter signed the proclamation designating the first Sunday of September after Labor Day as the National Grandparents' Day.

We have compiled some of the most touching and loving quotes from some of our favourite celebrities about their grandparents.

Barack Obama was raised by his grandparents and he has always been very vocal in his appreciation for the impact they had on him; especially about his grandmother. He says, "She's the one who taught me about hard work. She's the one who put off buying a new car or a new dress for herself, so that I could have a better life. She poured everything she had into me."

Rihanna, who was very close with her grandmother Dolly, who passed away in 2013, said this about her in an interview with Oprah. " She (My grandmother) taught me a lot about forgiveness, loving my enemies ... spirituality, faith, strength as a woman ... The one thing she wants me to do is marry someone who loves me more than I love them.." In commemoration of her grandmother's first death anniversary, Rihanna posted on Instagram, ".... I can still remember your laugh, and I miss it, I miss the sound of your voice, your beautiful hands, the way you danced and got so happy when you heard music, i miss doing your makeup and taking your pictures, I miss the way you looked right at me, and I miss looking back at you, that proud look on your face! Never did I think it could be this soon, but I'm happy you're in Heaven, laughing and dancing with the Angels! Dolly you are my precious Angel, I love you beyond what words can describe! I just miss you Gran Gran! #Dolly #FirstAnniversary"

Justin Bieber's mother, who was a young single mom when she had him, got a lot help from her parents Bruce and Diane Dale in raising him. And even through all the negative press and his ridiculous scandals, grandmother Diane has been a rock. She says, "It's going to happen anyways. It doesn't matter who you are and a lot of it isn't even in true... He's 19 and he's got a camera shoved in his face and lots of money. What do you want?" She however knows about all his antics: "I think if [moviegoers] see Justin the way I see Justin, they'll accept him—warts and all—and see that he's not as bad as the press makes him out to be sometimes, and he's not as innocent as he tries to paint himself sometimes," Chu said. "He's a troublemaker. It's what he is and he's charming as hell, but that's who he is and that's what makes him Justin Bieber."

Katy Perry, the world-renowned pop-star has credited her grandmother Ann Hudson as the person who keeps her grounded. "My grandmother is in charge of my morals..I do anything wrong, she'll come after me." The "Roar" singer also takes her as plus one to many entertainment events.

Miley Cyrus' grandmother Loretta Finley is a loving presence in the "Wrecking Ball" singer's life. The twerking expert even has a tattoo of her grandmother's portrait, and occasionally takes her on tours and premieres with her. During a recent interview at "Jimmy Kimmel Live!" Cyrus said, "My grandma is fresh. She's always in jumpsuits, like terry cloth jumpsuits ... I think for a grandma it's pretty cool. Snoop wears 'em. They actually have very similar style".