Joe Jonas at lunch with a mystery redhead and brother Nick

He's in a relationship with Game Of Thrones star Sophie Turner.

But on Tuesday, Joe Jonas stepped out with a mystery redhead - as well as his younger brother Nick Jonas.

The trio enjoyed a lunch date at Sweet Butter in Sherman Oaks, California.

Keeping casual: Joe Jonas stepped out with a mystery redhead - as well as his younger brother Nick Jonas on Tuesday

Keeping casual: Joe Jonas stepped out with a mystery redhead - as well as his younger brother Nick Jonas on Tuesday

Joe, 27, kept it casual in his workout gear - as did his female pal and brother Nick, 24.

The DNCE frontman wore a grey Under Armour sweatshirt with coordinating leggings and shorts on top.

Joe carried a large bag in one hand while rocking a baseball cap and a heavy beard.

The mystery redhead flaunted her svelte form in navy leggings featuring striped paneling.

Brotherly love: Joe's brother Nick Jonas was also at the lunch

Brotherly love: Joe's brother Nick Jonas was also at the lunch

in conversation: The trio enjoyed a lunch date at Sweet And Butter in Sherman Oaks, California

in conversation: The trio enjoyed a lunch date at Sweet And Butter in Sherman Oaks, California

Lunch break: Joe kept it casual in his workout gear - as did his female pal and brother Nick

Lunch break: Joe kept it casual in his workout gear - as did his female pal and brother Nick

His companion styled her fitness bottoms with a maroon hued sports bra crop top and blue

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