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Harry Hamlin Gives His Daughter Delilah the Sweetest Birthday Gift Ever

The #RHOBH husband brought out a hidden talent in honor of his daughter's big day.

By Laura Rosenfeld Jun 13, 2016, 1:30 PM ET

Harry Hamlin really knows how to make a girl feel special. The Real Housewives of Beverly Hills husband performed a little ditty called "Delilah's Song" for his eldest daughter Delilah Belle Hamlin in a video posted on his wife Lisa Rinna's Instagram profile Friday. Harry wrote the song on the day Delilah was born, June 10, 1998, and strummed the tune on his acoustic guitar in honor of her 18th birthday Friday.

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Delilah's song. â¤ï¸
A video posted by Lisa Rinna (@lisarinna) on Jun 10, 2016 at 11:06am PDT

Lisa also sent a lot of love Delilah's way on Friday in the form of a ton of adorable throwback photos of the teenager. "Happy 18th Birthday Delilah Belle!!!" Lisa wrote on Instagram. "We are so proud of you and the woman that you've become. We love you so much."

Happy 18th Birthday Delilah Belle!!! We are so proud of you and the woman that you've become. We love you so much. â¤ï¸ @delilahbelle
A video posted by Lisa Rinna (@lisarinna) on Jun 10, 2016 at 7:57am PDT

#tbt @delilahbelle 10 days old. She will be 18 tomorrow. My how time flies. #18yearsago â¤ï¸
A photo posted by Lisa Rinna (@lisarinna) on Jun 9, 2016 at 7:19am PDT

You must have been a beautiful baby.... ð¼ Shot by @bensonlyndie ðâï¸ Singing away from day one @delilahbelle
A photo posted by Lisa Rinna (@lisarinna) on Jun 9, 2016 at 4:05pm PDT

Seriously is this not the cutest picture of @delilahbelle ?! With Her very happening @chazdean shag haircutð #HappyBirthdayDelilahBelle #18
A photo posted by Lisa Rinna (@lisarinna) on Jun 10, 2016 at 4:40pm PDT

Still celebrating! #love #purejoy ð
A photo posted by Lisa Rinna (@lisarinna) on Jun 11, 2016 at 10:00am PDT

The Rinna-Hamlin household must do a lot of celebrating this time of year since Monday also marks the 15th birthday of Harry and Lisa's daughter Amelia Gray. The family is celebrating Amelia's big day in style at Disneyland.

Happy Birthday Amelia Gray! 15 today! We are so proud of you! We love you so much! #gemini #proudparents #youareamazing ðððâï¸â¤ï¸ð @mimsygray
A photo posted by Lisa Rinna (@lisarinna) on Jun 13, 2016 at 7:42am PDT

Add me on snapchat I joined I'm one of the last holdouts: lisarinna1
A photo posted by Lisa Rinna (@lisarinna) on Jun 13, 2016 at 9:07am PDT

Lisa is pretty blown away by the fact that her little girls are growing into young ladies. "I can't believe how fast the time flies. We now have a 15 year old and an 18 year old! #grateful #blessed #love #family," the RHOBH actress captioned a vintage pic of the fab foursome. " Hug them and tell them you love them."

I can't believe how fast the time flies. We now have a 15 year old and an 18 year old! #grateful #blessed #love #family â¤ï¸ Hug them and tell them you love them.
A photo posted by Lisa Rinna (@lisarinna) on Jun 13, 2016 at 7:56am PDT

Keep on feeling the love by seeing more of Lisa and her family through the years, below.