Rumer Willis celebrated her boyfriend, Derek Richard Thomas, on Valentine's day.

She posted six pictures on Instagram featuring the lovebirds flaunting their affection.

Rumer called him her sweet man and confessed how happy she felt with him.

She thanked him for being her best friend, her partner in crime, and her confidant.

The 34-year-old also appreciated him for making her a mother and caring for her.

Thomas marked Valentine's day with a heartwarming tribute to his sweetheart.

He looked forward to dancing around the kitchen with their baby.

The couple announced their pregnancy last December on Instagram.

They posted a black-and-white picture of Rumer's baby bump, which her mom reposted.