The Danish beauty (40) was enticed to Ireland to endure the mud and rain of the packed festival to support her current beau Interpol frontman Paul Banks.
Not that she was slumming it with the rest of the punters -- Christensen got the VIP treatment from the moment she was whisked by luxury coach from Dublin's Morrison Hotel to the Kildare racecourse. Before leaving, she was seen rubbing shoulders on the Liffey quayside with members of Interpol and US indie rockers Kings of Leon.
The couple have been "quietly dating" for 10 months and were first photographed together in March.
Since the romance became public, Christensen has been a permanent fixture backstage at Interpol gigs.
In the past, she has been involved with INXS frontman Michael Hutchence, Simply Red's Mick Hucknall and Billy Corgan of the Smashing Pumpkins.
And while rockers U2 may not have made an appearance at Oxegen's this year, they were certainly making their presence felt.
Bono and co sent Interpol a special gift in advance of their Punchestown performance.
Paul Banks, Daniel Kessler and Carlos Dengler found a welcome surprise when they turned up for rehearsals at the venue.
An insider told the Herald: "U2 sent Interpol some champers as a gift."
The New Yorkers performed hits from their Our Love to Admire album in front of thousands of music fans as day one of Oxegen came to a close.
See pages 8 and 9