Posting her "favorite photo" of them, Barbie said she didn't expect to "fall for someone" she thought would only be a friend to her.
But Barbie said she was "really happy to have found both love & friendship with this one."
The ABS-CBN actress told Diego: "Thank you for making me happy & feel loved. Thank you for everything that you do to make me feel the love I deserve. So thankful for you, thank God for you."
Diego surprised showbiz fans on New Year's Day when he revealed his relationship with Barbie.
He thanked her for making the end of his 2020 a "memorable" one.
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