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Tiffani Thiessen, Instagram

Instagram

These photos will be the sweetest thing you'll see all day. 

It's only been a week since Tiffani Thiessen and her family of three welcomed a second bundle of joy into the world, but it's taken no time at all for 5-year-old Harper to fall in love with her baby brother Holt.

The White Collar actress shared intimate photos on Instagram of the doting siblings in the sweetest embrace. 

Harper looks absolutely angelic while cradling Holt in bed, the infant sporting an adorable navy onesie. "Harper can't get enough of her baby brother. #Familytime," Thiessen captioned the pic.

Tiffani Thiessen, Instagram

Instagram

In a second snapshot, the Beverly Hills, 90210 alum caught the duo cuddling during naptime. Thiessen's baby boy, wrapped in a gray striped blanket, looks right at home in the arms of his big sister! 

"My heart could not be more full of love for these two. #weareblessed," the 41-year-old wrote.

Tiffani's husband Brady Smith also shared his feelings on his newfound fatherhood status with another unforgettable moment. "Feeling incredibly grateful & blessed at the moment. #sweetbabyboy," the actor captioned the photo. 

Congratulations, you two! Harper already looks like the greatest big sister ever.