The blonde beauty also has two-year-old daughter Lavinia with her billionaire husband of four years, James Stunt.
Tamara posted on Instagram: 'Such a beautiful day congratulations @pstunt thank you so much we are so proud xxx'.
Petra and Tamara previously opened up about the work ethos their dad Bernie instilled in them from a young age.
The girls, who boast their own fashion and beauty businesses, revealed that the motoring maven is proud of their 'smart' investments - except when it comes to accessories.
'Maybe he thinks we buy too many handbags, which probably is true', Petra joked to Harpers Bazaar. 'He thinks one is fine.'
Tamara Ecclestone looks ladylike in a pink floral dress while cuddling up to daughter Sophia as Petra Stunt celebrates her twin boys' christening!
Her younger sister Petra Stunt welcomed twin boys in April.
And the Formula 1 heiress was joined by her close-knit family including her sister Tamara Eccelstone and her niece Sophia as they christened the babies at St Peter's Church in central London on Monday.
Tamara, accompanied by her dapper husband Jay Rutland, looked glamorous as ever in a pretty pink dress with a bold floral pattern.
The blonde beauty also has two-year-old daughter Lavinia with her billionaire husband of four years, James Stunt.
Tamara posted on Instagram: 'Such a beautiful day congratulations @pstunt thank you so much we are so proud xxx'.
Petra and Tamara previously opened up about the work ethos their dad Bernie instilled in them from a young age.
The girls, who boast their own fashion and beauty businesses, revealed that the motoring maven is proud of their 'smart' investments - except when it comes to accessories.
'Maybe he thinks we buy too many handbags, which probably is true', Petra joked to Harpers Bazaar. 'He thinks one is fine.'
The blonde beauty also has two-year-old daughter Lavinia with her billionaire husband of four years, James Stunt.
Tamara posted on Instagram: 'Such a beautiful day congratulations @pstunt thank you so much we are so proud xxx'.
Petra and Tamara previously opened up about the work ethos their dad Bernie instilled in them from a young age.
The girls, who boast their own fashion and beauty businesses, revealed that the motoring maven is proud of their 'smart' investments - except when it comes to accessories.
'Maybe he thinks we buy too many handbags, which probably is true', Petra joked to Harpers Bazaar. 'He thinks one is fine.'