I have a few strawberry plants growing in a container, none of which have produced fruit yet. When watering this week, I noticed this strange plant growing in there as well...

The leaves are noticibly different from the strawberries around it, but unline anything else in my garden! I can't tell if its supposed to be there or what I should do about it!

Here is a pic of the container:

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Here is a closeup of the possible "invader":

{{gwi:46419}}

Any suggetions or insights?