She posted a photograph of him on Instagram just minutes before De Gea took to the pitch for Spain's Euro 2016 opener against the Czech Republic on Monday.
"Come on David, Come on Spain!!!!" she wrote in the post, proving that the allegations against her long-term boyfriend had not diminished her support for him.
Edurne had not spoken publically since allegations broke last Friday that the Manchester United football star had been named in a sex abuse case.
The 25-year-old goalkeeper has strongly denied allegations that he organised a party at which two women were forced to have sex with two footballers, but the storm has taken the focus of Spain's arrival in France away from football.
Edurne, a pop singer who represented Spain at Eurovision in 2015, has been dating De Gea since 2010, two years before the alleged sex scandal occurred.
Usually prolific on social media she hadn't posted anything since a day before the allegations emerged leading to speculation that she was distancing herself from De Gea.