Only in September did the Spurs center back reveal his relationship with the 24-year-old.
But he has already proposed to the South African beauty, who dated Alexis Sanchez, a former Arsenal and Manchester United player.
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Additionally, Anna shared a few images of herself with Dier, 28, while wearing her engagement ring to share the news on Instagram.
She concluded by adding the short caption, “I said ja.”
Previously, a friend of the couple told The Sun that Eric and Anna were “blissfully happy. They have been interacting frequently.
“Eric has informed friends that the past few weeks have been excellent, as he was re-inducted into the England team and was able to land a gorgeous girl who had previously been riding on the arm of an Arsenal player.
“He keeps finding the back of the goal on the field and has scored a cracker.
“Anna is enamored and has hinted to others that Eric might be ‘the one. Watch this space because they are taking things seriously.
They got engaged just two months later, coinciding with Dier’s comeback to the England squad and his blooming love life off the field.
He is attempting to secure a spot in Gareth Southgate’s final 26-man World Cup roster, which is anticipated to be unveiled on Thursday.
In the meantime, Dier unintentionally assisted in Sanchez’s elimination from the Champions League earlier this week.
Tottenham rallied from a goal behind to defeat Marseille 2-1 in France and take first place in their group in a game Sanchez’s team Marseille needed to win to advance to the round of 16.
Marseille’s loss caused them to finish last in Group D and prevented Sanchez’s team from qualifying for the Europa League play-off round.