The 27-year-old Australian actress, who used to play Hayley Smith in Home and Away, said that she is enjoying living in Paris with 5-year-old Mia, 2-year-old Cruz and 7-month-old Ava while her tennis star husband Lleyton prepared for the French Open tournament.
"The kids are great and growing up so quickly. They interact with each other really well," Bec wrote on the couple's official website, adding that Mia and Cruz "cannot get enough" of their new little sister.
For the past two years, the family have lived in the Bahamas, which Bec has described as a "wonderful outdoors lifestyle". Lleyton recently told OK! magazine: "Mia loves building sandcastles and running on the sand and Cruz loves the water - he can't get enough of it! He's a really chilled-out kid. He actually suits the Bahamas."
A friend of Bec's has described her as a "nester" who "dreams of waking up in the same bed every day of the week, eating breakfast and for her kids to be surrounded by familiar toys and by relatives who love them".
Earlier this year, it was reported that Bec was living with the children in a Sydney property while Lleyton toured the world alone. The couple, however, are believed to have made a pact that they will travel the tennis circuit together until Lleyton retires.
Shortly after Ava's birth, Lleyton revealed that they were "elated" to be parents again. Sources later revealed that Bec hoped their expanding brood would force Lleyton to settle down in Australia.