Nicky Hilton congratulates older sister Paris Hilton on the birth of her first child: 'You are going to be the best mommy - what a lucky boy!'

Nicky Hilton has wished her older sister Paris Hilton well after news broke the 41-year-old DJ has welcomed a baby boy with her husband Carter Reum.

The 39-year-old mother-of-three took to Instagram to share a flashback photo with Paris and their mother Nicky Hilton from the 1980s.

And she added a touching caption: 'Welcome to mommyhood @parishilton! So so incredibly happy for youuu! It’s the most beautiful ride. There is no greater love. You are going to be the best mommy. What a lucky boy!'

Happy sister: Nicky Hilton has wished her older sister Paris Hilton well after news broke the 41-year-old DJ has welcomed a baby boy with her husband Carter Reum; here are Nicky and Paris with mom Kathy Hilton

Happy sister: Nicky Hilton has wished her older sister Paris Hilton well after news broke the 41-year-old DJ has welcomed a baby boy with her husband Carter Reum; here are Nicky and Paris with mom Kathy Hilton

A less Simple Life: Paris is a long way from her party days 20 years ago; seen with Nicky in Beverly Hills in the aughts

A less Simple Life: Paris is a long way from her party days 20 years ago; seen with Nicky in Beverly Hills in the aughts

Perfume designer Paris revealed the happy news on Instagram on Tuesday evening by sharing a close up of her hand holding her son's tiny hand.

'You are already loved beyond words,' she captioned the post.

For the Simple Life star, becoming a mother is fulfilling a lifelong dream. 

'It's always been my dream to be a mother and I'm so happy that Carter and I found each other,' she revealed to People.

The baby is here: Paris shared this sweet photo where she was holding her baby's hand

The baby is here: Paris shared this sweet photo where she was holding her baby's hand

'We are so excited to start our family together and our hearts are exploding with love for our baby boy.' 

The Hottie And The Nottie star used a surrogate to have her baby after undergoing IVF procedures to retrieve her eggs. 

In January 2022, Paris revealed that she would like to have 'probably two or three' children to E! News, saying  that she 'cannot wait' to be a mother, 'That is definitely one of my top priorities.'

Cute siblings: The ladies seen at Paris' splashy wedding last year; Nicky was the maid of honor

Cute siblings: The ladies seen at Paris' splashy wedding last year; Nicky was the maid of honor

As it turns out, Paris' bestie Kim Kardashian turned her onto the idea of IVF. 

'Kim was the one who told me about that,' she said oh The Trend Reporter with Mara podcast. 'I didn't even know anything about it. I'm happy that she told me that advice and introduced me to her doctor.'

This is the second child for Reum, 40, who allegedly has a secret child, a 10-year-old daughter from a previous relationship with with reality star Laura Bellizzi, known for appearing on the short-lived VH-1 show Secrets of Aspen, according to Page Six.

Old friends:  Paris' friend Kim Kardashian congratulated the new mom and offered her insights into her own IVF journey

Old friends:  Paris' friend Kim Kardashian congratulated the new mom and offered her insights into her own IVF journey

Paris and Reum got engaged in February 2021 after a bit more than a  year of dating. The Chicago native is an entrepreneur and long time friend of the Hilton family.

The new parents tied the knot in a three-day wedding ceremony that November at Paris' late grandfather Barron Hilton's lavish Bel Air, Calif. home. 

The ceremony was planned for November 11. "11:11 has always been my favorite time of day," Paris told Vogue. "It's my reminder to make a wish and be open to miracles."