Caitlyn Jenner welcomes seventh grandchild William Behr through her eldest son Burt

On Sunday, transgender activist Caitlyn Jenner shared a sweet snap of herself posing with her seventh grandchild - newborn baby boy William Behr - who arrived on February 9.

Her eldest son Burt with ex-wife #1 Chrystie Crownover touchingly named the infant after his 69-year-old father-of-six, who was actually born William not Bruce.

The 40-year-old Gladiator Tires driver - who's always been supportive of the two-time Olympic gold medalist - also has a two-year-old son Bodhi with his girlfriend, Valerie Pitalo.  

Squeee! On Sunday, transgender activist Caitlyn Jenner shared a sweet snap of herself posing with her seventh grandchild - newborn baby boy William Behr - who arrived on February 9

Squeee! On Sunday, transgender activist Caitlyn Jenner shared a sweet snap of herself posing with her seventh grandchild - newborn baby boy William Behr - who arrived on February 9

Touching tribute: Her eldest son Burt with ex-wife #1 Chrystie Crownover named the infant after his 69-year-old father-of-six, who was actually born William not Bruce (pictured in 2017)

Touching tribute: Her eldest son Burt with ex-wife #1 Chrystie Crownover named the infant after his 69-year-old father-of-six, who was actually born William not Bruce (pictured in 2017)

'I'm very excited [about Caitlyn's gender affirmation]. Part of me was screaming to say, "Hey, I've known for 25 years and I've always been supportive!" I always will be,' Burt told Esquire in 2015.

'Before I was allowed to tell anybody, or before my dad even knew that I knew, I went and marched on behalf of Prop 8 through the streets of Los Angeles. I've always tried to be an outspoken supporter of the LGBT community.'

Jenner also has a one-year-old granddaughter Stormi (through Kylie), three-year-old granddaughter Eva (through Brandon), as well as a 10-year-old granddaughter Francesca, seven-year-old granddaughter Isabella and two-year-old grandson Luke (through Cassandra Marino).

The baby news came after the retired decathlete enjoyed Valentine's Day with her constant companion since 2017, Sophia Hutchins, inside her $3.5M, four-bedroom Malibu hilltop home.  

Caitlyn wrote: 'Welcome to the world William Behr Jenner. Congratulations @burtonjenner and @valeriepitalo !! Love you guys'

Caitlyn wrote: 'Welcome to the world William Behr Jenner. Congratulations @burtonjenner and @valeriepitalo !! Love you guys'

Big brother: The 40-year-old Gladiator Tires driver - who's always been supportive of the two-time Olympic gold medalist - also has a two-year-old son Bodhi (R) with his girlfriend, Valerie Pitalo (L)

Big brother: The 40-year-old Gladiator Tires driver - who's always been supportive of the two-time Olympic gold medalist - also has a two-year-old son Bodhi (R) with his girlfriend, Valerie Pitalo (L)

Burt told Esquire in 2015: 'I'm very excited [about Caitlyn's gender affirmation]. Part of me was screaming to say, "Hey, I've known for 25 years and I've always been supportive!" I always will be' (pictured November 23)

Burt told Esquire in 2015: 'I'm very excited [about Caitlyn's gender affirmation]. Part of me was screaming to say, "Hey, I've known for 25 years and I've always been supportive!" I always will be' (pictured November 23)

'Happy first birthday Stormi!' Jenner also has a one-year-old granddaughter Stormi through Kylie (M), three-year-old granddaughter Eva through Brandon, as well as a 10- year-old granddaughter Francesca & seven-year-old granddaughter Isabella through Cassandra Marino (pictured February 10)

'Happy first birthday Stormi!' Jenner also has a one-year-old granddaughter Stormi through Kylie (M), three-year-old granddaughter Eva through Brandon, as well as a 10- year-old granddaughter Francesca & seven-year-old granddaughter Isabella through Cassandra Marino (pictured February 10)

'Sophia set up Valentine's dinner at the house,' Caitlyn - who boasts 14.4M social media followers - said in a video.

'Looks very good! Boom there she is with a great sunset.'

Despite the romantic evening for two, People magazine claimed last week that the registered Republicans' 'relationship is purely platonic.'

The 22-year-old Pepperdine University alum (born Scott) serves as the executive director of Jenner's foundation, and they're gearing up to celebrate International Transgender Day of Visibility on March 31. 

'Poppin' bottles!' The baby news came after the retired decathlete enjoyed Valentine's Day with her constant companion since 2017, Sophia Hutchins, inside her $3.5M, four-bedroom Malibu hilltop home

'Poppin' bottles!' The baby news came after the retired decathlete enjoyed Valentine's Day with her constant companion since 2017, Sophia Hutchins, inside her $3.5M, four-bedroom Malibu hilltop home

Caitlyn said in a video: 'Sophia set up Valentine's dinner at the house. Looks very good!'
Caitlyn said in a video: 'Sophia set up Valentine's dinner at the house. Looks very good!'

Caitlyn said in a video: 'Sophia set up Valentine's dinner at the house. Looks very good!'

'Boom there she is with a great sunset!' Despite the romantic evening for two, People magazine claimed last week that the registered Republicans' 'relationship is purely platonic'

'Boom there she is with a great sunset!' Despite the romantic evening for two, People magazine claimed last week that the registered Republicans' 'relationship is purely platonic'

'Today it's so simple. I wake up in the morning and be myself all day,' the former KUWTK patriarch told Fox 10 Phoenix in November.

'I want to concentrate on this next generation coming up, the ones that are 5 to 15 to 20 years old, this next generation coming up to make it easier for them. Don't put all of these challenges out in front of them. Make it more normal.'

The Through the Keyhole guest panelist added: 'We need hard legislation on equality in this country. We need amendments to the Civil Rights Act for the LGBTQ community. There's no reason why politically, we have to treat one group of people this way and another group of people this way.'

Partners: The 22-year-old Pepperdine University alum (born Scott) serves as the executive director of Jenner's foundation, and they're gearing up to celebrate International Transgender Day of Visibility on March 31 (pictured February 10)

Partners: The 22-year-old Pepperdine University alum (born Scott) serves as the executive director of Jenner's foundation, and they're gearing up to celebrate International Transgender Day of Visibility on March 31 (pictured February 10)

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