Billie Eilish 21 leaves State Farm Stadium with boyfriend Jesse

Billie Eilish, 21, leaves State Farm Stadium with boyfriend Jesse Rutherford, 31,

Billie Eilish, 21, stands out in a sleek Burberry hat as she leaves State Farm Stadium with boyfriend Jesse Rutherford, 31, after watching the Kansas City Chiefs win their third Super Bowl

Billie Eilish was in good company on Sunday as she watched the Kansas City Chiefs win only their third Super Bowl in their 64-year history at State Farm Stadium in Arizona.

The American singer was joined by friend Jesse Rutherford on a night where the Chiefs clinched a narrow 38-35 win over the Philadelphia Eagles.

As Eilish, 21, left the stadium in front of 78,600 later that night, she stood out in a stylish cap from British heritage brand Burberry, an accessory which she paired with sleek Gucci shorts and a loose-fitting shirt.

A bandana and long white socks gave the look an edgy twist, while black strappy shoes finished it off as she prepared to head home.

The heavily tattooed Rutherford, 31, walked close behind his girlfriend and looked chic in a wide collar shirt and gray cardigan worn over striking maroon trousers.

Side by side: Billie Eilish was joined by boyfriend Jessie Rutherford on Sunday as she watched the Kansas City Chiefs win only their third Super Bowl in their 64-year history

Side by side: Billie Eilish was joined by boyfriend Jessie Rutherford on Sunday as she watched the Kansas City Chiefs win only their third Super Bowl in their 64-year history

The pair had previously manned a private box as the Chiefs made history on Sunday, with Patrick Mahomes planning a second-half comeback to defeat the Philadelphia Eagles 38-35 and win their second Super Bowl in four years.

Also in attendance were Hollywood stars Bradley Cooper and Paul Rudd, hitmakers Adele and Beyoncé, celebrity chef Gordon Ramsay and Beatles legend Sir Paul McCartney with his wife Nancy.

Alongside the game, Rihanna celebrated her much-anticipated return to performing live at the halftime show – during which she confirmed her second pregnancy.

Eilish and Rutherford’s appearance at the event comes after she sought a restraining order against 39-year-old Christopher Anderson, an alleged stalker who reportedly attempted to break into her family home.

Trending: When Eilish left the 78,600-capacity stadium later that night, she caught the eye in a stylish cap from British heritage brand Burberry

Trending: When Eilish left the 78,600-capacity stadium later that night, she caught the eye in a stylish cap from British heritage brand Burberry

Tres chic: Eilish arrived at the event in a cream button-up, Gucci skirt and black platform boots Designer: She accessorized with a designer Burberry bag

Tres chic: Eilish arrived at the event in a cream button-up, Gucci skirt and black platform boots

Stars at the Super Bowl!  Pop sensation Billie Eilish, wearing a beige button-down blouse and a patterned pocket square around her neck, was also spotted at the event partying with some friends in a private box

Stars at the Super Bowl! Pop sensation Billie Eilish, wearing a beige button-down blouse and a patterned pocket square around her neck, was also spotted at the event partying with some friends in a private box

Police were called to Eilish’s parents’ home in Highland Park around 9:15 a.m. on January 5 to respond to a call that a man, later identified as Anderson, was trying to scale the fence to get on to access the property.

The singer also claimed in the order originally released by TMZ that Anderson attempted to visit her family’s home multiple times in December, with local police filing multiple reports.

Eilish claimed these incidents caused her “significant fear, anxiety and emotional distress,” so much so that she no longer feels safe visiting her parents’ home.

Star-studded audience: Beatles legend Sir Paul McCartney and his wife Nancy were also in attendance

Star-studded audience: Beatles legend Sir Paul McCartney and his wife Nancy were also in attendance

Los eagles!  Bradley Cooper looked in his element as he enjoyed some nachos in a private suite at Super Bowl LVII on Sunday

Los eagles! Bradley Cooper looked in his element as he enjoyed some nachos in a private suite at Super Bowl LVII on Sunday

Sports fans: Big day: Jay-Z was the doting dad through and through as he brought his 11-year-old daughter Blue Ivy Carter to Super Bowl LVII on Sunday

Sports fans: Big day: Jay-Z was the doting dad through and through as he brought his 11-year-old daughter Blue Ivy Carter to Super Bowl LVII on Sunday