Mother's Day is all about showing love and appreciation to moms everywhere -- including single mothers.

This Sunday marks the 110th official Mother's Day holiday in the U.S. and many other countries around the world.

Celebrated annually on the second Sunday in May, Mother's Day gives everyone the opportunity to pamper their mom, wife, daughter, grandmother, aunt, or stepmother -- whether it be with a day at the spa, a shopping spree, a bouquet of her favorite flowers, a dinner date, or even just a simple homemade card.

While it's important to express gratitude to the special women in one's life all year round, taking the time to send them a message or greeting and let them know they're loved on Mother's Day could make their day.

Single moms who are raising their children by themselves especially deserve some love on this day.

Here are 15 Mother's Day quotes and greetings from celebrities, authors, parenting experts and more for single moms, courtesy of Parade, Woman's Day and Reader's Digest.

1. "A mother is she who can take the place of all others but whose place no one else can take." - Cardinal Mermillod

2. "The moment a child is born, the mother is also born. She never existed before." - Rajneesh

3. "She has to have four arms, four legs, four eyes, two hearts, and double the love. There is nothing single about a single mom." - Mandy Hale

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4. "Mothers are the people who love us for no good reason. And those of us who are mothers know it's the most exquisite love of all." - Maggie Gallagher

5. "Just because I am a single mother doesn't mean I cannot be a success." - Yvonne Kaloki

6. "When you are a mother, you are never really alone in your thought. A mother always has to think twice, once for herself and once for her child." - Sophia Loren

7. "Whatever else is unsure in this stinking dunghill of a world, a mother's love is not." - James Joyce

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8. "I have time for everything I had time for before. I just have an added amazing thing in my life." - January Jones

9. "When you look into your mother's eyes, you know that is the purest love you can find on this earth." - Mitch Albom

10. "God could not be everywhere, and therefore he made mothers." - Rudyard Kipling

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11. "Being a single mum is twice the work, twice the stress and twice the tears but also twice the hugs, twice the love and twice the pride." - Anonymous

12. "There's no way to be a perfect mother and a million ways to be a good one." - Jill Churchill

13. "For me, motherhood is learning about the strengths I didn't know I had, and dealing with the fears I didn't know existed." - Halle Berry

14. "Being a single parent is not a life full of struggles, but a journey for the strong." - Meg Lowrey

15. "We are born of love; love is our mother." - Rumi

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