The 35-year-old actress is expecting her first child with fiance Jesse Plemons.
William stopped for a pint of Guinness during the celebration, while Middleton stuck to water.
The 33-year-old reality star posed topless for the campaign earlier this week.
This will be Houska’s second child with husband Cole DeBoer.
She announced she was expecting in January.
The 'Bachelor' couple announced their second pregnancy in November.
The reality star is currently expecting her first child with boyfriend Tristan Thompson.
She answered some fan pregnancy questions on Twitter on Sunday.
The two former reality stars shared the news on social media over the weekend.
On Thursday, the 33-year-old expecting mom took to her app and website, where she opened up about her pregnancy and revealed that she's been 'eating like a beast.'
The expecting mother says she's 'eating like a beast.'
The Duchess of Cambridge is eight months pregnant with her third child.
The group filmed scenes for ‘Keeping Up With the Kardashians’ on Tuesday.
The 'Counting On' star announced she was expecting her first child with husband Jeremy Vuolo in January.
