The yoga teacher, who gave birth to daughter Carmen in August, has no doubt turned to the form of exercise she knows best in order to regain her pre-pregnancy figure.
The 29-year-old performs an impressive headstand for the beach photo wearing bright pink ruched bikini bottoms and a black bandeau top.
"Last day in Hawaii... I'm gonna miss it here!!," she captioned the shot which was taken against a stunning blue sky backdrop on a golden sandy beach.
Clearly revived by her break on the tropical island, a few days previously she wrote "I love that nothing matters here #honolulu#peace #sindrama #hakunamatata."
Extra correspondent Hilaria shared the first photo of her Hawaiian holiday three weeks ago and has sent a steady stream of ocean views and dramatic sunrises and sunsets ever since.
The new family have clearly enjoyed a period of blissful bonding time on the paradise island.
Carmen is Alec's second child – he is also a father to 17-year-old Ireland from his marriage to Kim Basinger.
The happy couple introduced their baby girl to HELLO! in an exclusive interview in September.
They announced their pregnancy news in February, eight months after they were married in a romantic New York ceremony held at St Patrick's Old Cathedral on 30 June.
They tied the knot in front of 175 loved one before moving to the Kimmel Center at New York University, where Alec studied, to celebrate.